2d + 13 = 12
d = -0.5
-0.5 × 2 = -1
13 + (-1) = 12
Hope this helped☺☺
Explanations:
Twice a number d and 13 = 2d + 13
The sum = Total
Is 12 = "= 12"
That equals :
2d + 13 = 12
Lets calculate derivative of

That is:

Comparing that with offered answer we can see that results match.
x-intercept is where the line intersects the x-axis. This would be point (-250, 0). It will be marked in pink in the image below.
y-intercept is where the line intersects the y-axis. This would be point (0, 100). I will be marked in green in the image below.
Hope this helped!
~Just a girl in love with Shawn Mendes