How can i prove this? Please someone help i get 100points

Compare the cost of the bike trips from the two companies shown.for both the cost in a linear function of the number of days which statements is true

Graph the equationy= x+3[tex]y = x + 3[/tex]

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square