Answer:
x = 13
Explanation:
assuming you require to find x and the measure of the angles.
(3x + 9)° and (10x + 2)° are same- side interior angles and sum to 180°
sum the 2 angles and equate to 180, solving for x
3x + 9 + 10x + 2 = 180 ( simplify left side )
13x + 11 = 180 ( subtract 11 from both sides )
13x + 11 - 11 = 180 - 11 ( simplify both sides )
13x = 169 ( divide both sides by 13 )
x =
, that is
x = 13
then by substitution
3x + 9 = 3(13) + 9 = 39 + 9 = 48°
10x + 2 = 10(13) + 2 = 130 + 2 = 132°