SOLUTION: Write an equation which models how old, in years, you will be when you are 3 times as old as the younger person. Age now (mother) = 35 Younger person (daughter) age now = 14 age

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Question 146358: Write an equation which models how old, in years, you will be when you are 3 times as old as the younger person.
Age now (mother) = 35
Younger person (daughter) age now = 14
age difference = 21 years
mother = X + 21
daughter = X
I was thinking it should be 3x + 21 = 3X.
It's not coming out right. Please help.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Mother = M = 35
Daughter = D = 14
In x years, the mother will be,
M=35%2Bx
In x years, the daughter will be,
D=14%2Bx
When will the mother be 3 times the daughters age?
M=3D
35%2Bx=3%2814%2Bx%29
35%2Bx=42%2B3x
-2x=42-35
-2x=7
x=-7%2F2
3 1/2 years ago, the mother was 3 times the daughter's age.
The mother was 31 1/2 years old.
The daughter was 10 1/2 years old.
Are you sure the mother and daughter ages are correct??