book Maths Puzzle Numerical Ability

3x+2y=23

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book Other Question

I need to graph the following equation. y=3/4x+2

Please I need help badly. Thanks
What are the steps in adding, subtracting, multiplying, and dividing these problems:
f(x)=3x^2+4x-5
g(x)=2x+9

&

f(x)=x/x+1
g(x)=x^2-1