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January 29, 2015

January 29, 2015

Posted by **sue** on Tuesday, January 19, 2010 at 7:02pm.

3x – 2y = 8

2x + 5y = -1

- math -
**Reiny**, Tuesday, January 19, 2010 at 7:06pmI would only use substitution if I can isolate one of the variables without having to go into fractions.

In this case I would use elimination.

multiply the first by 5 and the second by 2, then add them :

15x - 10y = 40

4x + 10y = -2

19x = 38

x = 2

now sub that back into one of the originals. Take it from here.

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