Question

find the measure of angle A

Answer 1

Use an equation to solve this. We know that a triangle has angles that add up to 180, correct?

Answer 2

yes we know

Answer 3

So we add all 3 angle to get to 180.
So,
a + 21y+13 + 6y+1 = 180

Answer 4

So which term can we combine?

Answer 5

21y and 6y. 13 and 1

Answer 6

After doing that, what would your equation look like?

Answer 7

a + 27y + 15 =180

Answer 8

Hold. 13 + 1 = 15?

Answer 9

i mean 14 sorry

Answer 10

Alright. So our equation looks like:
a + 27y + 14 = 180
We want to find a, so we must get rid of 27y and 14.
We must do inverse PEMDAS to find y.
So we must get rid of 14.
How do we get rid of 14?

Answer 11

subtract it from 180

Answer 12

Correct! What would your equation look like after subtracting?

Answer 13

a + 27y = 166

Answer 14

Remember. We want to find a, so we need to get rid of 27y.
How can we get rid of 27y?

Answer 15

divide 166 bye 27

Answer 16

by*

Answer 17

Okay. What would your equation look like after that?

Answer 18

a+y= 6.14

Answer 19

Opps. My bad. Let restart a little bit.
a + 27y = 166

What's the opposite of addition?

Answer 20

so it would be a=27y + 166?

Answer 21

-27y

Answer 22

Not quite. After doing that, what would your equation look like?

Answer 23

well thats where im a little bit lost at.

Answer 24

is whats after a+27y=166

Answer 25

Oh okay. So you have
a + 27y = 166
-27y -27y
------------------------
a = 166-27y, make sense?
Or a = -27y + 166.

Answer 26

yes it makes sense

Answer 27

Alright. I hope this help! :)

Answer 28

it did thanks!!!