Please help, I’m just getting back to school and forgot how to do this. Solve using y=mx+b.
slope = undefined, and point = (-4, -8).
Please use an explanation so I can understand better in the future!

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.