The diagram shows the proportional relationship between the number of buckets of water and the number of buckets of joint compound mixed to make a wall-texturing mixture.
What is the constant of proportionality in terms of buckets of joint compound per bucket of water?
A.
1.5
B.
2
C.
0.67
D.
3
C. 0.67
Explanation: To find the constant of proportionality, you can divide the number of buckets of joint compound by the number of buckets of water for any point on the graph. For example, at the point (6, 4), the ratio is 4/6 = 0.67. This means that for every 1 bucket of water, you need 0.67 buckets of joint compound.