Help pls it due today

Answer for 10 points show work you guys in advanced < 3

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.

Three consecutive integers have a sum of 234. what are the three integers