The solution for X= 0 and for y= 4x+11
Each of the 4 friends spent 15 dollars so all you need to do is multiply 4 by 15. 4x15=60
72.9°
use tangent.
from the corner y look for the opposite and adjacent sides to your angle.
the opposite side from corner y is 13
the adjacent side from the corner is 4
tanY = 13/4
Y = inverse tangent of 13/4
72.897
