exam Maths Puzzle Numerical Ability

I have to graph this equation on a grid. I know how to graph it, I just don't know how to do the equation.

Here is an example of what my teacher gave me. plug -2 in for x.
2x=

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exam Other Question

I am finding the coordinates for the x- and y- intercepts.I need help working this problem out, please.
y=-2/3x the answers are (0,0) (-3,2) (3,-2)
Please show me how to get the answers, thank you
solve 4A/3=1/2b^2c^2d for c

thank you