book Maths Puzzle Numerical Ability

how does one graph y=x/2 ?

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book Other Question

Simplify by dividing:

x^3+2x^2+3x-6/x-1

I don't understand why I can't do this, but I know once I see it I'll hopefully understand! :) I need help with this Equation:

4 over x+1 minus
1 over x equals 1

Thank you