book Maths Puzzle Numerical Ability

How Do I Solve This Problem?

x-2/2 - x+2/4 = 1/2

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book Other Question

I need help on this one!!

x-3y + 4z = 22
-2x + 5y - 3z = -27
7x + 4y + 2z = 26
My question says to solve the system of this inequalitie by graphing.
y-x<0
3y>2x-15 (the > has a line underneath of it.)

I dont know how to solve this or graph it. could y