When Josh babysits, he charges a flat fee of $4 plus an hourly rate of r dollars. Josh worked 4 hours at his last job. The equation below represents the amount Josh earned.
4r+4=22
What is Josh’s hourly rate?

Idon't see any graph, however the graph of the function : f(x) = x²-2x+3 is a parabola: 1) open upward (since a> 0)2) it intersects y-axis in 3 (y=3)3) its axis of symmetry is x = +1 ( -b/2a)4) it's minimum is y = -2, so its vertex is (1,-2)5) it doesn't intersect the x-axis since discriminant < 0