Answer:
10 is your answer for x.
Step-by-step explanation:
Note that the sum of the angles of a triangle is 180°.
Add all the angles together and set them equal to 180:
60 + 80 + 4x = 180
Simplify. Combine like terms
140 + 4x = 180
Isolate the variable (x). Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. First, subtract 140 from both sides
140 (-140) + 4x = 180 (-140)
4x = 180 - 140
4x = 40
Next, to fully isolate the variable (x), divide 4 from both sides:
4x = 40
(4x)/4 = (40)/4
x = 40/4
x = 10
10 is your answer for x.
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