Which line has a slope of 1/2?

Line B

Step-by-step explanation:

The slope is the rise over run of a line, in this case is rise of 1 unit over the run of 2 units

#1,
Plugging in 320, we get the answer as 78.20. f(320) = 0.11(320) + 43.
This eliminates answer choices C and D.
Now, in the question it says that x is minutes. 320 is substituted in place of x, meaning that the price is for 320 minutes.

Answer is B.

#2,
x-intercept can be found when y = 0
2x -6(0) = 24
2x = 24
x = 12
x-intercept is (12,0)

y-intercept can be found when x = 0
2(0) - 6y = 24
-6y = 24
y =  -4
y-intercept is (0,-4)

Answer is C.