Posted by kathy on Monday, November 29, 2010 at 10:40pm.
first one times 9 ---> 27x + 18y = - 198
2nd one times 2 ---> 10x - 18y = 50
add them : 37x = -148
x = -4
I will let you finish it.
3x+2y=-22 (1)
5x-9y=25 (2)
Multiply (1) by 9 and (2) by 2 to get the y's to cancel
27x+18y=-198 (3)
10x-18y=50 (4)
Add (3) and (4) together
37x=-148
Divide both sides by 37
x=-4
Substitute that in either original equation (1) or (2) to solve for y. Check to make sure it works for the other equation, as well.
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