exam Maths Puzzle Numerical Ability

Trying to help my son logically solve following problem (rather than using guess and check):
(t^2) + m = 28
t + (m^2) = 148

Solve for t and m.

Thanks

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exam Other Question

Amelia chose 3 CDs that each cost $16. The sales tax on the three CDs is $3.96. Write a direct variation equation relating sales tax to the price. Graph the equation you wrote in. Please simplify this:

1/a-b + 4/b-a - 8/a+b - 11a-5b/b^2-a^2

I have no idea where to begin. Please help--Thanks.