exam Maths Puzzle Numerical Ability

can someone please help me with this problem:

Which of the following is a line perpendicular to y = 1/2x + 4 ?

a. y = 1/2x - 1/4
b. y = 2x - 4
c. y = 2x - 1/4
d. y = -2x

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exam Other Question

Solve by using addition or substitution.If a unique solution does not exist, state whether it is inconsistant or dependant.
10x+2y=7
y=-5x+3

Thanks again for your valuable tim please help solve the following:

(x+3)^3/2 = 8

thanks