book Maths Puzzle Numerical Ability

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

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book Other Question

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 3-4(x-1)/6=-3(x+2)-5