book Maths Puzzle Numerical Ability

Need help solving:

-3x +3/4=1/8

Thanks

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book Other Question

I need to know how to graph
x+2y=3
3x-y=-5

And I also need to know how many solutions it has.
Could you please help me? thanks! If g(x) = 2x - 3, D = {Reals}, and h(x) = x squared + 1, D = {Reals}, find:

a) (g + h)(-2)
b) gh(1/2)