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15. Determine the values of the unknown variables

I really just need help with how to find the X in the situation. I know how to go from there I'm just unsure how to find the X.

Thank you!

15. Determine the values of the unknown variables I really just need help with how-example-1
User Squinlan
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For the left-hand triangle we know:
(x+7)\°+(3x-18)\°+(x-9)\°=180\°.
Solving for
x we have:

5x\°-20\°=180\°

5x\°=200\°

x=40\°
So the angles on the left are: 47,31 and 102 degrees.

On the right we have
y\°+(x+21)\°+(x+17)\°=180\°
Substituting known values and solving we get:

y\°+61\°+47\°=180\°
[tex]y=72\°[/tex}
So the angles on the right are, 72, 61 and 47 degrees.


User Ben Rudolph
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