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Solve the following systems by elimination: 5x + 3y = - 9
7x + y = -3

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Mlcparra16id
5x + 3y = -9 ... [1]
7x + y = -3 ... [2]

[1] - 3[2]
5x + 3y = -9
-21x -3y = 9
    -16x = 0
         x = 0

So:
7x + y = -3
7(0) + y=  -3
0 + y =  -3 
y = -3

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