4 The number of miles represented on a map is directly proportional to the number of centimeters measured on a map. A certain Texas map uses the scale 2 cm = 150 miles.
Part A
Determine the constant of proportionality and explain its meaning in the problem situation.

Part B
If x represents the number of centimeters and y represents the number of miles, write a
direct variation equation to represent the number of miles as a function of the number of
centimeters measured on the map.

Part C
If the distance on a Texas map from San Marcos to Austin is 3.8 cm lang, what is the actual
distance between the two cities?

Part D
According to the map, how many centimeters would represent a distance of 525 miles?