Answer:
Equation 5x+15=180°
x=33°
Explanation:
Angles on a straight line always add up to 180°.
Form an equation:
4x+15+x=180° (Both of the red and blue angles add up to make the straight line).
Collect like terms:
Like terms are terms with the same variables and powers.
4x+x=5x
Put it back into an equation:
5x+15=180°
To find x, you would have to do inverse operations to isolate it.
180-15=165°
5x=165°
165÷5=33° (We divide by 5 because, in algebra, when a number is next to a letter it means times and as we want the inverse we divide).
So, x=33°
Hope this helps :)