book Maths Puzzle Numerical Ability

A line through points (-5,2) and (2,y) has a slope of 3. Find y.

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book Other Question

how can i soved this equation? coz I keep on solving it but i can't:
[(x^5-3x)+(3x^2-1)][(x^5-3x)-(3x^3-1)]
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z-12/3=4