Posted by **David** on Saturday, January 8, 2011 at 1:56pm.

Hi. I am having some problems with substitution method and i just can't seem to get these right. I have

1. 2x - 3y = -1 with y = x-1

2. -4x + y = 6 with -5x- y = 21 and finally,

3. -5x + y =-3 with 3x -8y = 24

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