Question

What is the value of y?
Y + 30°
A. 85°
B. 55
c. 110°
D. 10°​

Answer 1

Answer: The answer is B, 55 degrees.

Explanation:

You substitute 55 into y, making it 55+85, +55, +40, making it 180 degrees. Since all sides in a triangle add up to 180, B is your correct answer.

Hope that helps!

Answer 2

B. 55°

Explanation:

Note that the total angle measurements of a triangle is = 180°.

Add all the measurements together:

40 + y + 30 + y = 180

Simplify. Combine like terms:

(40 + 30) + (y + y) = 180

70 + 2y = 180

Isolate the y. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. First subtract, then divide.

Subtract 70 from both sides:

70 (-70) + 2y = 180 (-70)

2y = 180 - 70

2y = 110

Divide 2 from both sides:

(2y)/2 = (110)/2

y = 110/2

y = 55

B. 55° is your answer.

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