PSAT Math Multiple-Choice Practice Question 651
Question: 651
For every 8 units of x, there are consistently 12 units of y. If the relationship between x and y is given as an equation of the form y = kx , where k is a constant, what is the value of k ?
Correct Answer: C
Explanation:
(C) When x = 8, y = 12. We want to know the proportionality constant. We can do this by plugging the values of x and y into the equation and solving for k:
12 = 8k
Dividing by 8 tells us that 
. Reducing this fraction gives choice (C) as the answer, 
.
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