Choose the rate that represents: 175 miles in 4 hour​

The sum of two numbers is 86, and their difference is 20. find the two numbers

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.