👉 This graph shows how the time required to ring up a customer is related to the number of items being purchased.

👉 What is the rate of change?

Write your answer as a decimal or integer.

_____  seconds per item

✈️ Find any two points on the line.

• Two points on the line are (0, 20) and (50, 50). Put those points into the slope formula.
• slope = change in y / change in x
• = 50 − 20 / 50 − 0 ——-> Plugin (0, 20) and (50, 50)
• = 30/50 ——-> Subtract
• = 3/5 ——> Simplify
• = 0.6 ——-> Write as a decimal
• The slope is 0.6. The rate of change is 0.60 seconds per item.

This graph shows how the number of flowers Marcy can have in her garden is related to the number of seed packets she purchases.

👉 What is the rate of change?

Write your answer as a decimal or integer.

_____  flowers per seed packet

✈️ Find any two points on the line.

• Two points on the line are (0, 10) and (20, 40). Put those points into the slope formula.
• slope = change in y / change in x
• = 40 − 10 / 20 − 0 ——-> Plugin (0, 10) and (20, 40)
• = 30/20 —–> Subtract
• = 3/2 ——> Simplify
• = 1.5 ——-> Write as a decimal
• The slope is 1.5. The rate of change is 1.50 flowers per seed packet.

👉 This graph shows how the number of pictures Gina has taken so far this year is related to the number of days she spends on holiday.

👉 What is the rate of change?

Write your answer as a decimal or integer.

_______  pictures per day

✈️ Find any two points on the line.

• Two points on the line are (0, 2) and (1, 4). Put those points into the slope formula.
• slope = change in y / change in x
• = 4 − 2 / 1 − 0 ——> Plugin (0, 2) and (1, 4)
•  = 2/1 ——> Subtract
• = 2 —–> Simplify
• The slope is 2. The rate of change is 2 pictures per day.