The image of (2,-3) after a reflection in the line y=x is ?

What is the slope of a line that is perpendicular to y = 3x + 1

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .