f(x) = x ; horizontal shrink by a factor of 1/3

Answer 1

f(x) = 3x is a horizontal compression by factor of 1/3

the point (1,1) is stretched up to (1,3) by a vertical stretch

which also makes (1/3, 1) a point on the stretched transformed function

(1,1) to (1/3,1) is also a horizontal compression by factor of 1/3, x in f(x)=3x is 1/3 the value of x in f(x)=x