SOLUTION: Please help me with this equation..thanks so much. f is a function defined by f(x)=-x/5 and g is a function defined by g(x)=7-3x then 4g-5f= this was on the board in class..

Question 74169: Please help me with this equation..thanks so much.
f is a function defined by f(x)=-x/5 and g is a function defined by g(x)=7-3x
then 4g-5f=
this was on the board in class..i am not sure where to begin..thanks
Answer by uma(370) (Show Source): You can put this solution on YOUR website!
g(x) = 7 - 3x
4g(x) = 4(7 - 3x)
= 28 - 12x
f(x) = x/5
5f(x) = 5(x/5)
= x
Thus 4g - 5f = 28 - 12x - x
= 28 - 13x

Good Luck!!!
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