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

Answer 1

A $15 per hour

Explanation: The constant of proportionality is the rate at which earnings change with respect to the number of hours worked. In this case, the rate at which Matthew's earnings are changing is $15 per hour.