X+y= -9 x+2y= -25 According to the system of equations above, what is the value of y?

asked Apr 26, 2019 175k views

2 votes

X+y= -9

x+2y= -25

According to the system of equations above, what is the value of y?

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2 votes

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.

Yves Martin answered Apr 30, 2019

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