Question

How do you calculate constant rate of change from a proportional graph given the coordinates (x, y)?

Question 1 options:


x/y


y + x


xy


y/x

Answer 1

y/x

Explanation:

If y is directly proportional to x, then:

y = kx

k is the coefficient of proportionality, or the constant rate of change. Solving for k:

k = y/x