Answer: As you can see Plumber A has a greater initial fee or greater y-intercept .so the answer is D.
Explanation:
We know that plumber A has a initial fee of 100 but we need to find the initial fee and slope for plumber B.
(1,105) ( 2,160)
160 - 105 = 55
2-1 = 1
55/1 =5 so the slope for plumber B is 55
105 = 1(55) + b this is the formula used to find the y-intercept
105 = 55 + b
-55 -55
b= 50
So the equation for Plumber B is y = 55x + 50
Now compare equations y=55x + 50 and y= 30x + 100