Question 738561
y+2=0

-2  -2

Y=-2

SUBSTITUTE IN SECOND EQUATION

5x-2y=9

5x-2(-2)=9

5x+4=9

-4   -4

5x=5
/5
x=1

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0x+1y=2...................(1)
5x-2y=9....................(2)

multiply eq.(1) by -2

we get 
0+2y=-4
5x-2y=9
add up
5x=5
/5
x=1
y=2