Question

how do you graph f(x)=5x-45

Answer 1

I suggest having a scale factor of 5 for the y axis only ( you MUST mark that on your paper )
Y-intersect is -45 so start there
Then go up five units ( one on the scale for the y axis only ) and over right one ( x axis )
Continue that then connect the dots
For the other side, down 5 left one

Answer 2

The graph is the line passing through the points (0;-45) and (9;0)