Question

In the function

f(x) = 3x - 6
how does an increase of 1 in the independent variable x affect
f(x)?

f(x) will have an increase of 3
f(x) will have an increase of 9
f(x) will have a decrease of 3x - 3
f(x) will have a decrease of 3

Answer 1

substitute 1 instead of the variable x:
f(x)=3(1)-6=3-6=-3

Answer 2

hence f(x) will have a decrease of 3