Question

The value of y is proportional to x. When x=3 , then y = 15. Which equation represents the relationship between x and y?

A.y=5x
B.y=12x
C.y=0.2x
D.y=45x

Answer 1

• A. y = 5x

Explanation:

Direct proportion equation:

• y = kx, where k is the coefficient of proportionality

We have:

• x = 3 and y = 15

Using the equation to find the value of k:

• 15 = 3k
• k = 15/3
• k = 5

The equation of the line:

• y = 5x

Correct choice is A