book Maths Puzzle Numerical Ability

i need help with evaluating functions. Can you help me with this problem


f(x)=1/2x+2 the x value is -6

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book Other Question

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
solve for the ordered pair

2x-y= 5

y= 3x-4

I got x= 9/5 y=-7/5