Step-by-step explanation:
△ on the right hand side is a equilateral triangle
which means all interior angles are the same, which is 60°
for the overall triangle, thats a right angle on the top, which is 90° obviously
so because THAT right angle is formed by (4x-2)° and one of the interior angle from the equilateral triangle, which is 60°
so
90°=60°+(4x-2)°
30°=4x°-2° (Hi)
32°=4x°
x=8°
now for the △ on the left hand side is a isocelea triangle, which means two of its angle are the same
so that
(4x-2)°=(7y+9)° (Hi:Sub in (4x-2)°=30° into the equation)
30°=7y°+9°
21°=7y°
y=3°
