X+y= -9
x+2y= -25
According to the system of equations above, what is the value of y?
1 answer:
Try this option:
if x+y=-9 is I (one)
and x+2y=-25 is II (two), then
if II-I, then (x+2y)-(x+y)=-25+9 ⇔ y=-16.
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