Final answer:
To find the cost of each teacup, an equation can be set up based on the given information. The equation is 18 + 4c = 42, and by solving for c, we find that the cost of each teacup is $6.
Step-by-step explanation:
To find the cost of each teacup, we can set up an equation based on the information given:
Let c be the cost of each teacup.
Rebecca chose the largest teapot, which cost $18. She also painted 4 small teacups. The total amount spent on pottery is $42.
So, we can write the equation: 18 + 4c = 42.
Now, we can solve for c:
18 + 4c = 42
4c = 42 - 18
4c = 24
c = 24/4
c = 6
Therefore, the cost of each teacup is $6.