Hello and Good Morning/Afternoon
Let's take this problem step-by-step:
The sum of all angles in a triangle is equal to 180 degrees:
[tex]\hookrightarrow x + 120 +20 = 180\\\hookrightarrow x + 140 = 180\\\hookrightarrow x =180-140=40[/tex]
∠y and ∠x are on a flat line ⇒ total angle measured between is 180°
[tex]\hookrightarrow x + y = 180\\\hookrightarrow 40 + y = 180\\\hookrightarrow y = 180-40=140[/tex]
Answer: y = 140°
Hope that helps!
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