Question 35341
if 2x+y=3
-2x+5y=-9

What you do is you line them up according to terms...so with

 2x+ y= 3
-2x+5y=-9

whats 2x  -2x...........0
whats  y  +5y...........6y
whats  3  -9............-6

So the new formulas after doing like terms is....
0+6y=-6
6y=-6

y=  -1

Know plug y=-1 back into any of the 2 original equations to get x

2x +(-1)= 3
2x=4
 
x=2