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07-05-2020
Mathematics

contestada

If mZABF = (7x + 20)". mZFBC = (2x - 5) ".
and mZABC = 159º. find the value of x.

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sqdancefan sqdancefan

07-05-2020

Answer:

x = 16

Step-by-step explanation:

We assume that ray BF lies between BA and BC, so that ...

∠ABF +∠FBC = ∠ABC

(7x +20) +(2x -5) = 159

9x +15 = 159 . . . .collect terms

9x = 144 . . . . . . . subtract 15

x = 16 . . . . . . . . . .divide by 9

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