Since the highest degree of the expression is 1, hence the function is linear and rate of change is -2/3
If a function has these two essential requirements, it is said to be linear:
Additivity/Linearity: The function needs to be additive, which means that the value of the function at each input separately equals the value of the function at the total of the two inputs.
Degree 1 Homogeneity: The function must be homogenous of degree 1, which means that its value at a scaled input must match its value at the original input.
Using the coordinate points (0, 3) and (3, 1) to determine the equation
y = mx + b
m = slope = 1-3/3-0
slope = -2/3
y-intercept = 3
The equation will be y = -2/3 x + 3
Since the highest degree of the expression is 1, hence the function is linear and rate of change is -2/3