3 years ago

What values of x and y satisfy the system of equations {x = −2y + 1 | 13x + 8y = 11?}

1 answer:

5 0

Y= -2/-18 or Y= 0.1111
X=-2(-0.1111)+1
or X=0.77778

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Answer: The answer is (C) 180°.

Step-by-step explanation: Given that m∠A = 40°. ∠B is a complement of ∠A and ∠C is a supplement of ∠B. We are to find m∠B + m∠C.

Since ∠B is a complement of ∠A, so we have

$m\angle A+m\angle B=90^\circ\\\\\Rightarrow m\angle B=90^\circ-m\angle A=90^\circ-40^\circ\\\\\Rightarrow m\angle B=50^\circ.$

Now, since ∠C is a supplement of ∠B, so we have

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$m\angle B+m\angle C=50^\circ+130^\circ=180^\circ.$

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