Question

The rate of change is 2. It represents a decrease in the amount of raspberries in the bucket for each batch Iris makes.
The initial value is 18. Iris picked 18 cups of raspberries.
4
10
7
4
Batches,
Raspberries Left in Bucket (cups), y
1
16
Write an equation to represent the cups of raspberries left in the bucket, y.
+
y
-2
18
=
C

Answer 1

Let x = number of batches Iris makes. The amount left decreases by 2 cups per batch from an initial 18 cups, so

y = 18 − 2x (equivalently y = −2x + 18).

Check: for x = 1, y = 16.