Question 218389
5x-2y=-1 multiply by 2 & add
7x+4y=53
10x-4y=-2
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17x=51
x=51/17
x=3 ans.
5*3-2y=-1
15-2y=-1
-2y=-1-15
-2y=-16
y=-16/-2
y=8 ans.
Proof:
7*3+4*8=53
21+32=53
53=53