SOLUTION: Martha is 1 year older than twice his sisters age. The difference of their ages is 8. Find their present ages

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Question 813739: Martha is 1 year older than twice his sisters age. The difference of their ages is 8. Find their present ages
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
1) M=2S+1
2) M-S=8
setting the equations up to solve...
M-2S=1
-M+S=-8

-S=-7
S=7
M=2(7)+1=15