Answer:
y = 13.5 when x = 3.
Explanation:
First, we find the equation of the proportional relation.
The standard form an equation of direct variation is
y = kx
We need to find the number for k for this relation.
We use the given point.
y = 9 when x = 3.
9 = k × 3
k = 9/2
k = 4.5
The relation is:
y = 4.5x
Now we let x = 3
y = 4.5(3)
y = 13.5