The graph shows Matthew’s earnings.

Question

Matthew's Earnings
Earnings (dollars)

Time (hours)

What is the constant of proportionality that relates Matthew’s earnings, y, to the number of hours he worked, x?
Responses

A $15 per hour$15 per hour

B $16 per hour$16 per hour

C $17 per hour$17 per hour

D $12 per hour$12 per hour

Answer 1

A $15 per hour

The constant of proportionality is the rate at which earnings increase based on the number of hours worked. In this case, the constant of proportionality is $15 per hour, meaning for every hour worked, Matthew earns $15.