priarm8799
28.11.2020 •
Mathematics
Which linear equation represents the graph A) y = 7x + 3 B) y = 7x + 10 C) y = 1 7 x + 3 D) y = 1 7 x + 10
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Ответ:
Step-by-step explanation:
I am sorry but I cannot see the graph
Ответ:
Let m∠BCE = x
Then m∠ACE = x as well since CE is bisecting ∠ACB.
m∠ACD + x + x = 180° ⇒ m∠ACD = 180° - 2xConsider ΔBEC
Since BE = EC, the opposite angles are congruent:
∠BCE ≅ ∠CBEThen:
m∠CBE = m∠BCE = xFind the angle BEC:
m∠BEC = 180° - (x + x) = 180° - 2xComparing the above we see that:
m∠BEC = m∠ACDproved