Answer:
x = 12
Explanation:
NB. Supplementary angles / Angles of a straight line add up to 180°
180° - 124° (the given angle)
= 56°
This means that the other part of the angle must be equal to 56° ...in other words (4x + 8)° = 56°
(4x + 8)° = 56°
56° - 8°
= 48°
So 4x = 48°
-Divide both sides by 4 in order to get rid of the 4 infront of the x so that you're able to get x alone to solve.
4x ÷4 = 48° ÷4
x = 12
You can substitute 12 in the place of x to see if this is correct.
(4(12) +8)° = 56°
56° + 124° = 180°
....therefore x = 12