Posted by **Anonymous** on Tuesday, February 21, 2012 at 3:15pm.

Solveing using the addition method

-5x-9y=19

8x-7y=-9

- algebra -
**Reiny**, Tuesday, February 21, 2012 at 5:12pm
1st times 8 ----> -40x - 72y = 152

2nd times 5 ----> 40x - 35y = -45

add them

- 107y = 107

y = -1

back into 1st:

-5x + 9 = 19

-5x = 10

x = -2

- algebra -
**MathGuru**, Tuesday, February 21, 2012 at 5:22pm
We can solve x or y, so I'll pick y. Let's get rid of x by multiplying the top equation by 8 and the bottom equation by 5:

8(-5x - 9y = 19)

5(8x - 7y = -9)

-40x - 72y = 152

40x - 35y = -45

---------------

.... -107y = 107

.........y = -1

I'll let you take it from here to figure out the value of x. Check solutions with the original equations. It always helps to check your work!

I hope this will help get you started.

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