Posted by Loren on Sunday, September 11, 2011 at 11:27pm.
Equation 2 looks like it would be easy to solve for x, so we take it and isolate x:
x - 3y = 1
x = 1 + 3 y
Now we can use this result and substitute x = 1 + 3 y in for x in equation 1:
3x - 5y = 11
3 * ( 1 + 3 y ) - 5 y = 11
3 + 9 y - 5 y = 11
3 + 4 y = 11
4 y = 11 - 3
4 y = 8 Divide both sides with 4
y = 2
x = 1 + 3 y
x = 1 + 3 * 2
x = 1 + 6
x = 7
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