Find the slope between (-1,3) and (1,3)

What is the point-slope form of the equation for the line with a slope of -2 that passes through (1,4)?

Kevin is an insurance salesman. when he sells a policy, he makes 20 percent of the policy premium (p) up front; then each year the policy is active, he receives 15 percent of the original premium. which equation could be used to figure his total commission on a policy that has been active for five years? c=0.80p c=0.20p + 0.15p c=0.35p + 4(0.15) c=0.95p

Find the equation using the point (4,8)