Y=mx+b helps to find slope of a line.
B is where it starts on the y axis.
m is the slope.
The answer would be 73 degrees because 62 +12 = 73
Just take any two points from the graph. For example (4, -2) , (0, -3) Slope = (y2-y1) / (x2-x1) = -2-(-3) / 4-0 = 1/4