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Solve the following systems by elimination:
2x + 2y = 3
4y – 5x = 15

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Mlcparra16viz
2x + 2y = 3 ... [1]
-5x + 4y = 15 ... [2]

2[1] - [2]
4x + 4y = 6
5x - 4y = -15
    9x = -9
     x = -1

So:
2x + 2y = 3
2(-1) + 2y = 3
-2 + 2y = 3
2y = 5
y = 5/2

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