s = 1800°
To find the sum of interior angles in a polygon you can use the following equation
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3x+4y= 12 and 2x-y=8
1 answer:
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1 + 4x = -5 + 7x
<u> -4x </u> <u> - 4x </u>
1 = -5 + 3x
<u>+5 </u> <u>+5 </u>
6 = 3x
2 = x
Answer: x = 2
