How many miles will be remaining after 49 minutes of driving?

Question

 

Tammy is driving to Miami. Suppose that the remaining distance to drive (in miles) is a linear function of her driving time (in minutes). When graphed, the function gives a line with a slope of
−0.7
. has
59
miles remaining after
33
minutes of driving.

 

Answer 1

per description: Y = -0.7X+b

and 59 = -0.7*33+b, so b=82.1

then: Y = -0.7X + 82.1

 

after 49 min, Y = -0.7*49 + 82.1 = 47.8 miles left