Answer:
Option 1
Step-by-step explanation:
The formula of constant porpotionality is
[tex]y = kx[/tex]
or
[tex]y = \frac{k}{x} [/tex]
where k is the constant of porpotionality.
This equation is direct variation so we will use
[tex]y = kx[/tex]
The equation is in the form
[tex]y = 1.5x[/tex]
1.5 is in k place so the constant of porpotionality is 1.5
