Answer:
see explanation
Step-by-step explanation:
let y = f(x) and rearrange making x the subject, that is
y = 5x + 4 ( subtract 4 from both sides )
y - 4 = 5x ( divide both sides by 5 )
= x
Change y back into terms of x
(x) = 
Answer:
12
Step-by-step explanation:
6y - 3z
6(4) - 3(4)
24 - 12
12
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Answer:
The solution is given in the photo