2y+3y-7y+4=16 -2y=12
y=-6
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-12-18+42+4=16
-30+46=16
16=16
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The equation is -2y + 16 = 10
x = 8 and y = 0
x+2y = -1 and 5x-4y = 16 Solving the simultaneous equations gives: x = 2 and y = -1.5
This means that 2y - 3 = 2y + 4 which is not possible.
y=16 x= -4