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March 29, 2015

March 29, 2015

Posted by **kia** on Thursday, January 25, 2007 at 9:39pm.

well how old is your sister

You are 9 and she is 3 (3x3=9)

Last year you were 8 and she was 2

(2x4=8)

your sister is 3 and you are 9

let x = sister's age

and y = your age.

================

last year sister's age was x-1.

last year your age was y-1.

y = 3x for this year.

y-1 = 4(x-1) for last year.

solve for x and y.

The answers above are correct but this tells you how to do it.

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