When solving this equation for t which of the following steps would not be algebraically correct?

Find the equation using the point (4,8)

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.

Guys can y’all me because i don’t understand to the questions of my cousin she tell me to do the homework plz me guys