# 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

https://brainmass.com/math/linear-algebra/substitution-addition-elimination-technique-370571

#### 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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