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December 20, 2014

December 20, 2014

Posted by **G** on Thursday, March 27, 2008 at 10:33am.

1) 4x-2y=-5

-x+2y=2

Answer in book: -1,1/2

2) -5x+2y=10

5x-3y=-10

Answer in book: -2,0

3) 2x-y=2

-2y+4y=-5

Answer in book: 1/2,-1

- Algebra -
**Dr Russ**, Thursday, March 27, 2008 at 10:50am4x-2y=-5

-x+2y=2

Adding the two equations together gives

4x-2y+-x+2y=-5+2

the ys on the LHS cancel to give

4x-x=-3

3x=-3

x=-1

substitute x=-1 into one of the starting equations.

4(-1)-2y=-5

-4-2y=-5

-2y=-1

y=1/2

Have a go at the others.

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