Proportional Equations Warm Up

Write an equation that relates the dollars earned (d) to the number of hours John worked (h).

• 9d = 1h

• d = h + 9

• d = 9h

• 9d = h

Find the constant of proportionality in this situation.

• 0.0357

• 28

• 1

• 56

Write a proportional equation that relates the miles driven (m) to the number of gallons of gas (g).

• 28m = g

• d = 28 + g

• m = 28g

Allison’s middle school team has designed t-shirts containing their team name and color. Print-o-Rama charges $8 for each shirt ordered. Write an equation to represent the cost of each shirt (c) to the number of shirts purchased (s).

• 8s = c

• 8c = s

• 8 + s = c

• 8 + c = s

Which equation represents a proportional relationship?

• y = 3x + 5

• y = 4x

• x = 3y

It cost $15 to send 3 packages through a certain shipping company. Write a proportional equation to represent the relationship between packages shipped (p) and their cost (c).

• 0.2p = c

• 0.2c = p

• 5p = c

• 5c = p

How do you write a proportional equation?