book Maths Puzzle Numerical Ability

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

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book Other Question

x=3y-1
x+2y=9

How do I solve the sytem of equation using the subsitution method? Please show the work! I have been working on this problem for a week and I still can't figure it out. This is what I have so what am I doing wrong?

Let the function f be defined by f(x) = 1/(sqrt1-x