## sws._. 3 years ago Christopher is 4 times as old as Michael. Ten years ago, Christopher was 9 times as old as Michael.How old is Christopher now?

1. sauravshakya

Let the present age of Christopher and Michael be x and y then, x=4y ........i x-10 = 9(y-10) .....ii

2. sauravshakya

Solve that two equations

3. sws._.

for x in the second equation do I put 4y? so the equation would look like 4y-10=9(y-10) ?

4. sauravshakya

Yep....... Now solve for y

5. sws._.

okay

6. sauravshakya

Then plug the value of y u get in eqn i to find x

7. sws._.

when i was solving the equation with the y i distributed and got 4y-10=9y-90

8. sws._.

then after that i added 9y to 4y

9. sws._.

and got 13y

10. sauravshakya

4y-10=9y-90 -10+90=9y-4y

11. sauravshakya

12. sws._.

ohhh

13. sws._.

yes i did

14. sauravshakya

So, what is the value of y

15. sws._.

16?

16. sauravshakya

YES

17. sauravshakya

Now what is the value of x then

18. sws._.

64?

19. sauravshakya

Very correct

20. sws._.

okay :) thank you

21. sauravshakya

WELCOME