SOLUTION: my sister is 9 years older than i am. the sum of our ages is 51. find our ages

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Question 653886: my sister is 9 years older than i am. the sum of our ages is 51. find our ages
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

let x be sister's age
if sister is 9 years older than i am,then I am
x-9

if the sum of our ages is 51 we will have:
x%2B%28x-9%29=51...solve for x
x%2Bx-9=51
2x=51%2B9
2x=60
x=60%2F2
highlight%28x=30%29...sister's age
x-9
30-9
highlight%2821%29 ....my age