Question

What is the value of x a.20 b.35 c.60 d.70

Answer 1

20°

Explanation:

They are Vertically Opposite angles and hence are equal.

So, x + 40 = 3x.

Answer 2

a. 20

Explanation:

You are solving vertical angles. Put the measurements equal to each other:

x + 40 = 3x

Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Subtract x from both sides.

x (-x) + 40 = 3x (-x)

40 = 3x - x

40 = 2x

Isolate the variable x. Divide 2 from both sides:

(2x)/2 = (40)/2

x = 40/2

x = 20

a. 20 is your answer.

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