SOLUTION: Mary is 12 years old. Robin her mother is 35. a. Write an expression for the person�s age y years from now. b. Write an equation stating that Robin is twice as old as Mary. How

Question 170510: Mary is 12 years old. Robin her mother is 35.
a. Write an expression for the person�s age y years from now.
b. Write an equation stating that Robin is twice as old as Mary. How old will they both be at this time?
c. What will their ages be when Robin is 3 times as old as Mary
I know that expression for the person's age y years from now is:
Mary: 12 + y
Robin: 35 + y
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
b. so when is robin twice as old as mary. Take you expressions
:
robin (35+y)=2 mary's 2(12+y)
:
35+y=24+2y--->combine like terms
:
y=11------->so robin will be and Mary will be
:
c. this time we have robin(35+y)=3 mary's(12+y)
:
35+y=3(12+y)
:
35+y=36+3y-->combine like terms
:
y=-1/2 so Robin was and Mary was
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