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February 28, 2015

February 28, 2015

Posted by **Janet** on Tuesday, October 23, 2012 at 3:02pm.

4x-y=5

4x+4y=-4

- algebra 1 -
**Steve**, Tuesday, October 23, 2012 at 3:23pmsubstitute y=4x-5 into 4x+4y=-4 to get

4x+4(4x-5) = -4

4x+16x-20 = -4

20x = 16

x = 4/5

so, y = -9/5

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