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Set up an algebraic equation for this problem:When Brett and his younger sister add their ages together the sum in 17. Brett is not a teenager yet. In fact his age is not even a two-digit number. How old is Brett's sister?

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B+Y=17
B<10
if B is 1, then S=17
if B is 9, then S=8
so, 8<S<17,

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