Find the slope intercept equation of the line containing (2, -3) and having slope m= 4

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Your friend, taylor, missed class today and needs some identifying solutions to systems. explain to taylor how to find the solution(s) of any system using its graph.

This size running track is usually called a 400 meter track. however if a person ran as close to the inside as possible on the track they would run less than 400 meters in one lap. how far away from the inside border would someone have to run to make one lap equal exactly 400 meters