exam Maths Puzzle Numerical Ability

if f(4)=0 and f(6)=6, which of the following could represent f(x)?

A. 2/3x-4
B. x+2
c. x-4
D. 3x-12

could u show me how to work this out and find the answer?

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exam Other Question

Under which of the following conditions of k will this quadratic, x^2 + 8x + k - 0, have real-number, but unequal roots? What is the slope of a line that is parallel to the following linear equations??

6y+2x=9