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