Question 122871
2x-4y=7 now multiply the other equation by 2 & add them.
8x-4y=-2
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10x=5
x=5/10
x=1/2 answer.
2*1/2-4y=7
1-4y=7
-4y=7-1
-4y=6
y=6/-4
y=-3/2 answer.
proof
4*1/2+2*-3/2=-1
2-3=-1
-1=-1