In the diagram below of triangle CDE, F is the midpoint of CE and G is the midpoint of DE. If m ECD = 51 – 7x, and m
ZEFG = -8x +53, what is the measure of ZECD?

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the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

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step-by-step explanation:

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