Please help me as soon as you can!

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

Is it greater than or less than7*3_9*2

What is the slope of the line (-7,2) (4,6)