book Maths Puzzle Numerical Ability

I am having problems factoring the following problem...can you help please?

5x(3)y(2) + 15x(2)y(3)

The numbers in parentheses are the exponents....thanks

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book Other Question

y=3/4x is 3x+y^2=7 a linear equation?
yes or no? and why?
thanks a lot for your help!