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Ber [7]
3 years ago
8

Can somebody help me ?? please .

Mathematics
2 answers:
erica [24]3 years ago
8 0

Answer:

X and 81 are supplementary angles meaning their measures add up to 180°.

Therefore,

81+x=180°

81+x-81=180-81

x=99

We can also see that the angle across from x in the top left corner is equal to x by vertical angles theorem. The angle (3y-9) is equal to that angle since parallels lines form congruent angles.

Therefore,

(3y-9)=x

(3y-9)=99

3y-9+9=99+9

3y = 108

y=36

Step-by-step explanation:

solniwko [45]3 years ago
6 0

Answer: First let’s find x.

A straight line adds up to 180 degrees. So wen know that X and the 81 degree angle should add up to 180, so x+81=180 is our equation. Let’s solve.

Subtract 81 from 180

You get x=99 degrees.

Let’s now find Y.

We know because of the alternate interior angles property that x will have to equal 3y-9. We already know x is 99. Let’s set up an equation. 3y-9=99 let’s add our 9. We get 108. Divide by 3. We get y=36.

Step-by-step explanation:

PLEASE ASK ANY FURTHER QUESTIONS IF YOU STILL DONT UNDERSTAND :)

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