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Posted by **Andrea** on Tuesday, September 25, 2012 at 2:46pm.

4x - y=5

4x + 4y= -4

Also by using elimination.

- Algebra -
**Steve**, Tuesday, September 25, 2012 at 3:05pmsubstitution: since you have y = 4x-5,

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

20x = 16

x = 4/5

y = -9/5

using elimination, subtract one equation from the other to get

5y = -9

y = -9/5

now solve for x to get x=4/5

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