exam Maths Puzzle Numerical Ability

i totally blow at graphs....

graph each function
f(x)={x-1 if -3<x<0
{3x-1 if x>or=0

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exam Other Question

This question is confusing me. Please help.

x - 3y is less than or equal to 0 please help explain how to do this problem:

The length of a rectangular wall is x units and its height is (x - 3) units. Find an expression for the perimeter of the wall.