They are proportional. If you divide 6/36 by 6 on the numerator and the denominator, you get the same fraction of 1.6.
18/6
18= the number of trucks
6= the number of hours
18/6= 3 trucks per hour
Start with the point-slope formula shown at the top in red.
Now, substitute your slope and coordinates in the formula.
Then distribute and combine lie terms.
Finally, add 2x to both sides to get your equation in standard form.