Answer:
x=6/7 and y=18/7
Step-by-step explanation:
If y = 3x and 2x + 4y = 12,
then substitute the value of y with 3x
2x + 4(3x) = 12
2x+12x=12
14x=12
x=12/14=6/7
y=3x=3*(6/7)=18/7
Given a regular 20-gon ( a 20 sided polygon )
The measure of each interior angle will be given by:

where n is the number of sides
Substitute with n = 20
So, the measure of each interior angle =

The sum of exterior angles = 360
So, the measure of each exterior angle = 360/20 = 18
Answer:
The answer is A
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