Okay well it kept saying that I for some reason was not using appropriate words so my long response got deleted.
tldr; we can treat this like a box that we put something into (x) and we get something back from it (y).
We can then take this data we get and put it in a table. This is useful for finding patterns.
I will post a picture of what a table may look like.
Hope this Helps!
There is no way that the amount of cars and trucks can evenly fit into the 270 minutes and $150.
The closet i got was
A) 6 trucks and 4 cars for $150 and 390 minutes
B) 2 trucks and 10 cars for $150 and 380 minutes
C) 3 trucks and 5 cars for $105 and 270 minutes.
The slope intercept form is 
Explanation:
The equation is 
Now, we shall bring the equation
in the slope intercept form.
The general form of the slope intercept is given by

Hence, we need to rewrite the given equation in this form.
Thus, we have,

Subtracting both sides of the equation by 5x, we get,

Multiplying both sides of the equation by (-), we get,

Thus, the slope intercept form of the given equation is 
70
the answer for the problem in the pic is A i think