Question 201999
2m=n-3
3m=2n-9
change one equation to terms of n=
2m=n-3
n=2m+3
substitute this for n in the other equation
3m=2(2m+3)-9
3m=4m+6-9
-m=-3  multiply through by -
m=3
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2(3)=n-3
6=n-3
9=n