What is the sum of (m + 3n) and (4m - 6n)?
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What is the sum of (m + 3n) and (4m - 6n)?
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Mulitply second equation by 3 and subract first equation from it,
3(3m+2n)−(4m+6n)=3(28)−54
9m+6n−4m−6n=30
5m=30
m=6
Substitute in first equation,
4(6)+6n=54
6n=54−24
6n=30
n=5
Thus m=6 and n=5