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Solve the following systems of equations by elimination:
x + 4y = -18
3x + 5y = -19

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Mlcparra16id
x + 4y = -18 ... [1]
3x + 5y = -19 ... [2]

3[1] - [2]
3x + 12y = -54
-3x - 5y = 19
       7y  = -35
        y  = -5

We substitute this to the first equation:
x + 4y = -18
x - 20 = -18
      x =2

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