What is the equation of the line that passes through the point (8,-4) and has a slope of 3?

Plz which expression is equivalent to the expression below?

What is the effect on the graph of the parent function f(x) = x when f(x) is replaced with 3f(x)? a) shifts the line 3 units up b) shifts the line 3 units down c) increases the slope of the line by a factor of 3 d) decreases the slope of the line by a factor of 3

Need on this one asap im almost done with this subject