what error did the student make?? PLEASE HELP ME

What Error Did The Student Make?? PLEASE HELP ME

Answers

Answer 1

Answer:

He did an error because he multiplied equation 2 wrongly.

The correct multiplication should have been:

-6x + 9y = 6        Multiply equation by 2 by 3

Step-by-step explanation:

Given the system of equations

3x-5y=4

-2x+3y=2

This is what student solved

6x - 10y = 8        Multiply equation 1 by 2

-6x + 3y = 6        Multiply equation by 2 by 3

_________

       -7y = 14

          y = -2

He did an error because he multiplied the equation 2 wrongly.

The correct multiplication should have been:

-6x + 9y = 6        Multiply equation by 2 by 3

NOW, HERE IS THE CORRECT VERSION

6x - 10y = 8        Multiply equation 1 by 2

-6x + 6y = 6        Multiply equation by 2 by 3

_________

       -4y = 14

          y = -2/7


Related Questions

The record high temperature recorded one year was 93°F while the record low temperature that year was -21°F. How much warmer was the high temperature than the low temperature?

114°F

-72°F

-114°F

72°F

Answers

Answer:

114°F

Step-by-step explanation:

114 + -23 = 93

the answer is a—-114

Find the amount of simple interest earned. Principal: $300. Annual interest rate: 6.5% Time: 3 years

Answers

Answer:

The simple interest is $58.5

Step-by-step explanation:

Mathematically;

Simple interest = PRT/100

where p is principal = $300

R is rate = 6.5%

T is time = 3 years

Substituting these values in the simple interest equation, we have that;

S.I = (300 * 6.5 * 3)/100 = $58.5

What operation is being done to the variable in the equation -5m = -40?

It's being multiplied by -5.
It's being multiplied by -40.
It's being divided by -5.
It's being divided by -40.

Answers

Answer:

[tex]\textbf{It's being divided by -40}[/tex]

Step-by-step explanation:

-5m = -40

-5m/-40

hope it helps!

(I'll mark brainlist!)

A square has a side length of 6 inches. It is enlarged and the new side length is 18 inches. What is the scale factor?

A. 3
B. 1/3
C. 12
D. 1/12

Answers

Answer:

A. 3

Step-by-step explanation:

Hope this helps!     :3

plz mark as brainliest!

what is the answer to the problem

Answers

The answer is A. Good luck


Y=-2x + 1
What is the value of y? (-5,___)

Answers

Answer: y=−2x+1

Step-by-step explanation:

The length of the base of a rectangle is 6 less than 3 times the width. The perimeter of the rectangle is 52 inches. What is the length of the base?

Answers

Answer:

The rectangle has a width of 18 inches and a height length of 8 inches.

Step-by-step explanation:

The perimeter of a rectangle is described by the equation:

[tex]p = 2w + 2l[/tex]

where l is width, h is height, and p is perimeter.

We're also told that the total perimeter is 52 inches.

We're also told that the length is six inches less than three times the width.  We can express that as [tex]w = 3l - 6[/tex].

We can plug that definition of w into the perimeter equation to find the length:

[tex]p = 2w + 2l\\52 = 2(3l - 6) + 2 * l\\52 = 6l - 12 + 2l\\52 + 12 = 8l\\8l = 64\\l = 64/8\\l = 8[/tex]

Now we can take that and the given perimeter, and substitute those into the perimeter equation to find the width:

[tex]p = 2w + 2l\\52 = 2w + 2(8)\\52 = 2w + 16\\36 = 2w\\w = 36 / 2\\w = 18[/tex]

So the width is 18

Can someone help me plz I will mark brainliest

Answers

the answer is infinite because they equal each other

Marie is saving money for home repairs. To date, she has saved $1,195. She needs at least $1,483 for the repairs. She plans to set aside $32 per week to add to her current savings. If this situation is modeled by the inequality below, how many more weeks, x, does she need to continue saving in order to have enough money for the repairs?

Answers

Answer:

Number of weeks= 9

Step-by-step explanation:

First, we need to calculate the money required to reach the objective:

Money required= 1,483 - 1,195

Money required= $288

Now, we can determine the number of weeks left to accumulate $288 and get to $1,483:

Number of weeks= 288 / 32

Number of weeks= 9

How many inches are in 1 2/5 groups of 1 2/3

2 and 4/15

2 and 4/8

2 and 1/3

2 and 2/3

Answers

Answer:

2 and 1/3

Step-by-step explanation:

1 2/5 = 7/5

1 2/3 = 5/3

(7/5) * (5/3) = 7/3

7/3 = 2 1/3

9 + 4[(4 + 2)3 - (32 + 2)]

Answers

the answer is = -55
your welcome

someone help me with this proof please ​

Answers

Answer:

the first statement is: AB is congruent to DC.

reason: given

Step-by-step explanation:

im not sure about the others

100 Points! If you do this for me! Need help :(

Answers

Answer:

#1. B

#2. D

#3. C

#4. statement A

#5. A

#6. C

#7. B

#8. D

#9. B

#10. D

#11. C

#12 & #13 & #14- sorry I dont get those

#15. A

Step-by-step explanation:

I did half of it, I'm sorry the rest like the stuff I'm doing in class rn and I don't get that stuff

Answer:

Brainliest to the guy above :)

Step-by-step explanation:

Find the sale price of the item. Round to two decimal places if necessary. Original price: $82.00 Markdown: 33%

Answers

Answer:

54.67 Dollars

Step-by-step explanation:

82 / 3 = 27.33, 82 - 27.33 = 54.67 :D

Answer:54.94

Step-by-step explanation:

Given that f(x) = x2 – 5x – 14 and g(x) = x – 7, find (f +g)(x) and
express the result in standard form.

Answers

Answer:

[tex](f+g)(x)=x^2-4x-21[/tex]

Step-by-step explanation:

We are given:

[tex]f(x)=x^2-5x-14\text{ and } g(x)=x-7[/tex]

And we want to find:

[tex](f+g)(x)[/tex]

This is equivalent to:

[tex]=f(x)+g(x)[/tex]

Therefore, by substitution:

[tex]=(x^2-5x-14)+(x-7)[/tex]

Rearranging gives:

[tex]=(x^2)+(-5x+x)+(-14-7)[/tex]

Combine like terms:

[tex]=x^2-4x-21[/tex]

hi just wanted to give u extra points and see if you liked my run off math project abt sporks
(run off of twilight forks)​

Answers

Step-by-step explanation:

Wait that's really interesting, what grade did you get on it? (Thank you for the points.)

37/20 can someone turn it into a simplified fraction

Answers

1/4 is the simplest you can get

Find the value of the monomial. 5x^3 for x=0.5

Answers

Answer:

The correct answer is 166.375 or 166.4 when rounded to the nearest tenth.

Step-by-step explanation:

If x = 0.5, then 5x^3 = 5.5^3.

5.5^3 is the same as multiplying 5.5 by itself 3 times.

5.5 x 5.5 x 5.5 = 166.375 or 166.4 when rounded to the nearest tenth.

Hope this helps! :D

Answer:

0.625

Step-by-step explanation:

First, you do 0.5^3=0.125

then 0.125 * 5 = 0.625

Simplify the complex fraction shown below: 1/4 over 10/9

Answers

Answer:

9/40 or 0.225

Step-by-step explanation:

A 12 pack of ice-cream sandwiches cost $7.20 and a 9 pack of ice-cream sandwiches costs $4.50. Which package of ice-cream sandwiches is the better buy? ​

Answers

Answer:

the 9 pack

Step-by-step explanation:

Answer:

9

Step-by-step explanation:

-3x + 7 - 5x < 15 true ​

Answers

Answer:

x>-1

Step-by-step explanation:

Solve -2 x + 6 = -20.

Answers

Answer:

x = 13

Step-by-step explanation:

Subtract 6 from both sides: -2x = -26

divide both side by -2 to isolate x: x = 13

Answer:

x = 13

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Step-by-step explanation:

Step 1: Define equation

-2x + 6 = -20

Step 2: Solve for x

Subtract 6 on both sides:                    -2x = -26Divide -2 on both sides:                      x = 13

Step 3: Check

Plug in x into the original equation to verify it's a solution.

Substitute in x:                    -2(13) + 6 = -20Multiply:                               -26 + 6 = -20Add:                                     -20 = -20

Here we see that -20 does indeed equal -20.

∴ x = 13 is the solution to the equation.

which of the followings are solutions that can be modeled with quadratic function? select all that apply

Answers

5) The height of a rocket after it is launched

For this case, what you should do is remember the kinematics expressions where we have:

a

v = a * t + vo

y = a * t ^ 2 + vo * t + i

Where,

a: acceleration

v: speed

y: vertical position

t: time

vo: initial speed

yo: initial position

We observe that the expression for the given position is given by a quadratic expression.

Solve for x please ill give brainlist

Answers

Answer:

8

Step-by-step explanation:

what answer this is ?

Answers

Answer:

A and C

Step-by-step explanation:

If the fraction is negative either the numerator or the denominator can be marked negative and it stays the same

a die is tossed 20 times. The results are shown in the frequency table below.

Find the experimental probablity of landing on 3.​

Answers

Answer:

Step-by-step explanation:

experimental probability is

number of times 3 appeared / number of tooses you experimented

[tex]P_{3} = \frac{1}{6}[/tex]

Help me please I’m struggling to much

Answers

Answer:

[tex]\frac{16}{5}[/tex] or [tex]3.2[/tex]

Step-by-step explanation:

The given triangles are similar, meaning that their corresponding sides are proportional.

The length of DC (I think its D) is 15 and the length of WZ is 3. ZY is in the same place as CE (16). Make a proportional relationship where Δ→Δ:

[tex]\frac{large}{small} =\frac{large}{small}[/tex]

[tex]\frac{DC}{WZ}=\frac{CE}{ZY}[/tex]

Insert the known values:

[tex]\frac{15}{3}=\frac{16}{x}[/tex]

x is the value of ZY. Solve by cross multiplying:

[tex]15(x)=3(16)\\\\15x=48[/tex]

Divide both sides by 15:

[tex]\frac{15x}{15} =\frac{48}{15} \\\\x=3.2[/tex]

ZY is 3.2.

:Done

I need help solve this problem

Answers

Answer:

i am not sure of my answer sorry can you make the question simpler maybe then I can answer it

Step-by-step explanation:

Find the domain, range, y intercept(s), intervals where the graph is positive, interval(s) where the graph is decreasing, and interval(s) where the graph is increasing

Answers

Step-by-step explanation:

It is worked out step by step.

is this fraction irrational or rational?
9.68 (the eight is repeating)

Answers

Answer:

Hello Mate! Ans : Yes, number x = 9.688888...... is rational number.

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