SOLUTION: Please help me solve this linear equation? Jenny’s mother is 7 times as old as Jenny is. In five years time, she will be 4 times Jenny’s age. Use simultaneous equations to deter

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Question 815125: Please help me solve this linear equation?
Jenny’s mother is 7 times as old as Jenny is. In five years time, she will be 4 times Jenny’s age. Use simultaneous equations to determine their present ages.
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
m = 7j
m + 5 = 4(j + 5)
m + 5 = 4j + 20
m = 4j + 15
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m = 4j + 15
7j = 4j + 15
3j = 15
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j = 5
m = 35
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