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3 September, 12:59

X+y = - 9

x+2y = - 25

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

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  1. 3 September, 13:13
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    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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