Question

find the range of f(x)=2-3x?

Answer 1

Y=2-3x
Y-2=3x
Y-2/3=x:y=x-2/3 hence range is all real no.

Answer 2

y=2-3x
3x=2-y
X=(2-y)/3
since o<x
(2-y)/3>0
2-y>0
y-2<0
y<2