Answer:
Option 1
Explanation:
The formula of constant porpotionality is
![y = kx](https://img.qammunity.org/2022/formulas/mathematics/high-school/mjrx2wz2ai96zh75efaejbba3hpk1t3xdo.png)
or
![y = (k)/(x)](https://img.qammunity.org/2022/formulas/mathematics/college/tlp1vtywuwymodqrn6s2d2x8w1u5iilv9c.png)
where k is the constant of porpotionality.
This equation is direct variation so we will use
![y = kx](https://img.qammunity.org/2022/formulas/mathematics/high-school/mjrx2wz2ai96zh75efaejbba3hpk1t3xdo.png)
The equation is in the form
![y = 1.5x](https://img.qammunity.org/2022/formulas/mathematics/high-school/kugfn66ye04slzgu4bhpuuo4utaknm6da8.png)
1.5 is in k place so the constant of porpotionality is 1.5