Rooter plus charges a $25 service fee plus $40 per hour of work done. is this a proportional or non-proportional relationship?
proportional; the constant of proportionality is $25/hour
proportional; the constant of proportionality is $40/hour
non-proportional; the rate of change is $25/hour
non-proportional; the rate of change is $40/hour

Non-proportional; the rate of change is $40/hour

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form or

In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin

Let

x -----> the number of hours

y ----> The total charge in dollars

The equation of the line in slope intercept form is equal to

where

m is the slope

b is the y-intercept

we have

substitute

This relationship is not proportional, because the line not passes through the origin

therefore

Non-proportional; the rate of change is $40/hour

because they could drop even lower..

4x and 6y

im not sure though