book Maths Puzzle Numerical Ability

Find an equation for the line with slope 1/2 and y-intercept 3.
I came up with 2x-y=3. Is this correct?

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book Other Question

if 2x+1 is a multiple of 5,and if 2x+1<100, how many possible values of x are prime numbers Evaluate the algebraic expression:

11v + vw^2 - w when v=12 and w = -3

I came up with 243, my college tutor came up with something different. Is this correct?