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