exam Maths Puzzle Numerical Ability

how do u find the value of k that makes each equation true when x=4 and y=-3
a)y=kx+5 b)y=-2x+k c)y=-kx-7

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exam Other Question

How do I translate:
"fourteen more than one-half of the sqaure of Z" into a variable expression. Find all roots of the polynomial x^3-x^2+16x-16. My answer is -1,4i,-4i is this right. thanks for looking at this problem.