exam Maths Puzzle Numerical Ability

This is our math project and is also our final!

A purching decision for an algebra textbook for the school system bust be made. The board of ed needs to know the cost of provid

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Hi, Can I have some help with this function?

Use f(x) = 2x - 8 and g(x) = 5x - 2 to evaluate the expression.
(a) f(g(-7))

(b) g(f(-7)) find values for m and b in the following system so that the solution to the system is (-3,4)

5x+7y=b
mx+y=22

5(-3)+7(4)=13
-6(-3)+4=22

Is this all the steps or am I missing something?