Question

How do you graph `f(x)=3x - 2` by plotting points?

Answer 1

Do a table of values for x from -1 to 3 and work out corresponding y values.
Eg when x=3, y=`3xx3-2=7` `=>(3,7)`
when x=2, y=`3xx2-2=4` `=>(2,4)`
when x=1, y=`3xx1-2=1` `=>(1,1)`
when x=0, y=`3xx0-2=-2` `=>(0,-2)`
when x=-1, y=`3xx-1-2=-5 =>(-1,-5)`
Now plot these coordinates and you will have your straight line.
As you get better at doing it you only need to do three points to get your line.