math
posted by Missy .
kristyn is 4 years younger than mario. 3 years from now, she will be two thirds as old as mario. find their present age.

k = Kristyn
m = Mario
k = m 4
(k + 3)= 2/3(m + 2)
Substitute the value of k in the second equation.
m  4 + 3 = 2/3m + 4/3
m  1 = 2/3m + 4/3
ELIMINATE FRACTION BY MULTIPLYING THE EQUATION BY 3.
3(m  1) = 3(2/3m + 4/3)
3m  3 = 2m + 4
3m  2m  3 + 3 = 2m  2m + 4 + 3
m = 7
Now put the value of m in the first equation. Or you can subtract 4 from 7.
k = 7  4
k = 3
Kristyn is 3
Mario is 7
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