The length on a rectangular field is (4y + 3x) m an the width is (2y - x) m. write an expression to show the perimeter of the rectangular field.

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.