Moving from the first point to the second, we see x increasing by 2 and y by 10. Thus, the slope of the line through these two points is m = rise / run = 10/2, or m = 5. Applying the point-slope formula y - k = m(x - h), we get:
y - 3 = 5(x + 1) (fully reduced point-slope form)
or y = 3 + 5x + 5, or y = 5x + 8 (slope-intercept form)
73+107 = 180. When the smaller of the two angles is 73 all of the smaller angles are also going to be 73 and since the angles MTS and STN are bigger angles they both have to be 107
