book Maths Puzzle Numerical Ability

Need some help
Find the equation of a line that contains the point (-2,4)and is parallel to
y=2x-3
thank you for your time.

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book Other Question

How do I do the following problem?

log 81=4
b^

Thank you for your help
I need to find f o g(x) and g o f(x).
f(x)=3x^2-5 g(x)= 8/x
Thank You