In a 30-60-90 triangle, the hypotenuse is the shorter leg times the square root of two. always sometimes never

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

Having a hard time understanding this question (see attachment).

5. write an equation for the line that is parallel to the given line and that passes through the given point. y = –5x + 3; (–6, 3)