book Maths Puzzle Numerical Ability

Please help.

(1/3)y2 + 12=5x where x=3

Note: the 2 next to the y means y to the second power. Thanks.

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book Other Question

Please, Calculate the equation of the linear function which contains the ordered pairs (-4,1) and (3,6). Let T be a linear operator in V. Prove that T^2 = 0 if and only if the range T is a subset of null T.