book Maths Puzzle Numerical Ability

solve for the ordered pair

2x-y= 5

y= 3x-4

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

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book Other Question

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

f(x)=1/2x+2 the x value is -6 Solve the equasions x+4=-1: 5b=-25: 3x+4=13: 5(x-2)=15: x+8=3(x-4)i tried 4+1=5is it right