What is the constant of proportionality for the equation y=1 1/2x?

1 1/2

Step-by-step explanation:

y = 1 1/2x

The standard equation of direct variation is

y = kx,

where k = constant of proportionality.

Here you have

y = 1 1/2x,

so 1 1/2 is k, the constant of proportionality.

1 1/2