The sum of a number and negative three multiplied by the number equations plz and is it nonlinear or linear

The average rate of change of over the interval is -6.

Step-by-step explanation:

The average rate of a function at a given interval is calculated by definition of secant line, whose slope is:

(Eq. 1)

Where:

- Lower bound, dimensionless.

- Upper bound, dimensionless.

- Function evaluated at lower bound, dimensionless.

- Function evaluated at upper bound, dimensionless.

If we know that , and , then the average rate of change of over the interval is:

Lower bound

Upper bound

Secant line

The average rate of change of over the interval is -6.