book Maths Puzzle Numerical Ability

{{{y=(1/2)x+1}}} the distance of the point (3,0)?

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book Other Question

Solve for the indicated variable:
2/w - y = z, solve for w

This is how I solved it, I'm I correct?
1/w = z + y/2

Thanks for your help i have a math worksheet need help badly.. my question is evaluate the fuction when x= 3 x=0 x=-2
f(x)=-4+3
how do you go about doing this??? can you show step by step i a