You formatted the equation wrong for the setting your calculus on i would recommend using a Ti-34
A line parallel to your equation has the same slope, so it should be in the form:
y = (-3/2)x + b
To figure what "b" has to be, plug in the point (4,0) and solve:
0 = (-3/2)*4 + b
0 = -6 + b
6 = b
So the equation of the line is:
y = (-3/2)x + 6
The answer is the first option: 1)
> the quantity
times
minus
all over 
The explanation is shown below:
1. To solve this problem you must pply the following proccedure:
2. Move the term
to the left member. As the variable is negative, multiply the expression by
and change the direction of the sign:

C. 5.75 calories per gram
Edit: 287.5÷50=5.75
402.5÷70=5.75