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Christopher is 4 times as old as Michael. Ten years ago, Christopher was 9 times as old as Michael.How old is Christopher now?

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Let the present age of Christopher and Michael be x and y then, x=4y ........i x-10 = 9(y-10) .....ii
Solve that two equations
for x in the second equation do I put 4y? so the equation would look like 4y-10=9(y-10) ?

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Other answers:

Yep....... Now solve for y
Then plug the value of y u get in eqn i to find x
when i was solving the equation with the y i distributed and got 4y-10=9y-90
then after that i added 9y to 4y
and got 13y
4y-10=9y-90 -10+90=9y-4y
got your mistake?
yes i did
So, what is the value of y
Now what is the value of x then
Very correct
okay :) thank you

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