Byron S. answered • 11/04/14

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Since you know the four angles add to 360, write the sum. Call the unknown angle X.

X + 90 + (6y+3) + (8y-5) = 360

X = 360 - 90 - (6y+3) - (8y-5)

You can simplify from there by distributing the negatives and collecting like terms.

Chance K.

11/04/14