Question

If F(X)= 6X-4 and F(A)= 26 what is the value of a? Explain?

Answer 1

$F(X)=6X-4 \hbox{ and } F(A)=26 \\ \hbox{substitute A for X:} \\ F(A)=6A-4 \\ 26=6A-4 \\ 26+4=6A \\ 30=6A \\ \frac{30}{6}=A \\ \boxed{A=5}$

Answer 2

26=6a -4
30 = 6am
(Divide both sides by 6)
A = 5