SOLUTION: Three years ago Susan was seven times as old as Mercy. Write down an algebric expression of there ages three years ago

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Question 1149036: Three years ago Susan was seven times as old as Mercy. Write down an algebric expression of there ages three years ago
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
s-3=7%28m-3%29
s-3=7m-21
s-7m=-21%2B3
7m-s=21-3
7m-s=18



Susan now, 7m-18
Mercy now, m

THREE YEARS AGO:
Susan, 7m-21
Mercy, m-3