Solve the following system of equations by substitution.
2x - y = 6
x + y = 6
2 answers:
y=-x+6
2x-(-x+6)=6
3x=12
x=4
4+y=6
y=2
X+y=6 so y=6-x using this value for y in the other equation:
2x-(6-x)=6
2x-6+x=6
3x-6=6
3x=12
x=4, and since x+y=6, 4+y=6 so
y=2
So the solution is the point (4,2)
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