there are three angles so it means this is a triangle and sum of all angles of a triangle is always 180°. these all angles add up to 180°.
open the brackets: 65°+3x-10+2x=180°
arrange the numbers and valuables: 65°-10°+3x+2x=180°
hence, angle 1: 65°
angle 2: 3x-10°
angle 3: 2x
the slope is 1/6
because when i made a line through the points given on agraph, the rise over run is 1/6