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Solve the following with the elimination method 9x +3y=-18; -9x+y=30

1 Answer

Elimination method :

The equations are and .

Add equation (1) and equation (2).

Divide each side by 4.

Substitute in the above equation (1).

Subtract 9 from each side.

Divide each side by 9.

Solution for the equations and is

answered Aug 22, 2015 by sandy Pupil
edited Aug 22, 2015 by sandy

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