Posted by im stuck on this one!! on Tuesday, January 18, 2011 at 10:55pm.
Substitution means we express one variable in terms of another, and substitute this expression into the second equation.
From (1), we have
subtract 2n from each side to get
Substitute m from (1a) into (2) to get:
-7n = -23 -5
-7n = -28
Substitute n from (2a) into (1a)
So m=-7, n=4
Substitute the values of m and n into equations (1) and (2) to verify that the solutions are correct:
THANKS!!!!!!! great explaining!!!
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