Time (hours). distance (miles)

2. 90

3. 135

5. 225

6. 270

a. find the constant of proportionality

b. use the constant of proportionality to write a unit rate for the data in the table.

c. write an equation to represent the relationship between time, t, and distance, d.

A) 90 / 2 = 45

135 / 3 = 45

225 / 5 = 45

270 / 6 = 45

The constant of proportionality is 45

B) The unit rate would be 45 miles per hour

C) The equation would be to multiply the constant (45 miles per hour) by the time (number of hours) to get the total distance:

D = 45t