How to find the ratio of the perimeter and area

Adalyn drove 12 miles from her home to her school and then drove back. graph a shows her distance from home during the trip. graph b will show her distance from the school during the trip. complete each statement about graph b.

Ill mark the brainliest if you me with the these three questions 7,8,9

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?