exam Maths Puzzle Numerical Ability

Solve the following systems by substitution
4x - 12y = 5
-x + 3y = -1

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exam Other Question

I just get confused with problems such as:

y=(1/8)x^2

I need to find the x-intercepts, but I do not know how to put the equation into the form that is needed. I believe it is standard form. did I work this problem correctly

3(3x-1)=3x-2(3-x)

9x - 3= 3x - 6 + 2x
9x -3 =5x - 6
4x-3=-6
x=-.75