Taylor G.

asked • 11/12/13# elimination

4x-6y+4

-2x+7=-3y

solve using elimination

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## 2 Answers By Expert Tutors

Jason S. answered • 11/16/13

Tutor

4.9
(116)
My goal is the success of my students. Knowledge-Patience-Honesty

Assuming you mean...

4x-6y = 4

-2x+7=-3y

-2x+7=-3y

Solving by elimination, instead of substitution...

Put x and y on the same side of the second equation

-2x + 3y = -7

Multiply the bottom equation by 2

4x - 6y = 4

2(-2x + 3y) = 2(-7) => -4x +6y = -14

Add both equations together:

0 = -10

No solution.

This is why I posted the comment about you reposting the question.

Jason S.

If you change the -3y you posted into +3y, then of course it works out as Adam posted below.

Thus the reason I posted the comment asking you to verify that you posted the question correctly.

Have a great day.

Have a great day.

Report

11/16/13

Adam P. answered • 11/12/13

Tutor

New to Wyzant
Math Tutor for All Levels

4x - 6y =4, solve for x

4x = 4 + 6y

x = 1 + (6/4)y

-2x +7 = 3y

-2(1 +6/4)y) + 7 = 3y (plug in solved value for x)

-2 - 3y +7 = 3y

-6y +5 = 0 (set equal to zero and combine like terms)

-6y = -5

**y = 5/6**

**use equation from above [x = 1 + (6/4)y] to find value of x**

x = 1 + (6/4)(5/6)

x= 1 + 30/24

x = 1 + 1.25

**x = 2.25**

**Check:**

4x - 6y = 4

4(2.25) - 6(5/6) = 4

9 - 5 = 4

**4 = 4 Check**

-2x + 7 = 3y

-2(2.25) + 7 = 3(5/6)

-4.5 +7 = 2.5

**2.5 = 2.5 Check**

Jason S.

Adam,

When Taylor posted the question,

-2x+7=

**-3y****Not**

-2x+7=

**3y**
Report

11/16/13

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Jason S.

11/12/13