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# substitution or addition/elimination technique to solve system of equations

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Use substitution or addition/elimination technique to solve system of equations.
Show steps of solution. please apply apply both techniques.

here it is...

2x + y = 6
x - y = -3

#### Solution Preview

Substitution:
1) Solve one of the equations for one of the variables. Say, solve the first equation for y:
y=6-2x
2) Substitute this expression for y into the other equation:
x - (6-2x) = -3
The equation becomes an equation in one variable only. Solve it for that vaiable:
x - 6 + 2x = -3
3x - 6 = -3
3x = -3+6
3x = 3
x = 1
3) Substitute the value that you found into ...

#### Solution Summary

This posting offers help with using substitution or addition/elimination technique to solve a system of equations.

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