Answer:
b = 30
Explanation:
You want the value of b given line y = 20x +b passes through the points (6, 150) and (11, 250).
Solve for b
The equation y = 20x +b can be solved for b:
b = y -20x . . . . . . . . subtract 20x
Using the given point (x, y) = (6, 150), you have ...
b = 150 -20(6) = 150 -120
b = 30