Answer:
The slope is
.
Step-by-step explanation:
Choose 2 points on the graph.
(7,3) and (2,2)
Use slope formula: 
=
The slope is
.
Ф = 3π/4. Transform it into Rectangular (or Cartesian) form .
The coordinates of Ф are x ,y in rectangular form ==> so:
tan(Ф) = y/x and y=x . tan(Ф) ==> y= x. tan(3π/4). we know that tan(3π/4)= - 1
Hence y = - x
Is the = -13. Is the response
It would be $38 total, because it would be 20 for the adults and 18 for the children