If cos(0)= -8/17 and sin(0) is negative, then sin(0)= and tan(0)=

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.