book Maths Puzzle Numerical Ability

a^2xy2
__________
a^3xy reduce to lowest terms

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book Other Question

I am have a problem understanding how to change this equation in the slope-intercept form. Please Help ME. y+2/3=1/2(x-2/5) Can you explain how I go about doing this?

Thanks!!! Im not sure what they want me to do.
Find g(9) given that g(x) = 2x + 3