exam Maths Puzzle Numerical Ability

Plot the gragh
f(x)=(1/2)x

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can you help me with setting up this problem and solve

find an equation of variation where y varies jointly as x and z and inversely as the square of w and y=20 when x=0.5, z=4, and w=5. Evaluate the function when x=4, x=0, and x=-3.

1.) f(x) = 1.5x - 0.4
2.) h(x) = 3/8x + 2/3
3.) g(x) = -14x + 5
4.) k(x) = 3.2 - 5x