Answer:
8 represents the rate of change while 6 represents the initial value
Step-by-step explanation:
For every additional kilometer d that we walks, d increases by 1 and m increases by 8 times d. So 8 represents the rate of change.
At d = 0, meaning d = 0, m = 8*0 + 6 = 6. So he gets 6 at before having to walk. So 6 represents the initial value