Respuesta :

MarkV
Hi there! The answer is x = 20°

The angles are supplementary, which means that the sum of the angles is 180°.

The sum of the angles also equals
[tex]3x + 40 + 80[/tex]

Therefore, we get the following equation.
[tex]3x + 40 + 80 = 180[/tex]

Collect terms
[tex]3x + 120 = 180[/tex]

Subtract 120
[tex]3x = 60[/tex]

Divide by 3
[tex]x = 60 \div 3 = 20[/tex]
I think the answer is 20 also

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