The figure below shows the relationship between two supplementary angles. Which of the following represents the value of x and a?

1) x=20

2) a=28

Step-by-step explanation:

1) 6x+3x=180

9x=180

x=180÷9

x=20

2) 50+2x+3x-10=180

40+5x=180

5x=180-40

5x=140

x=140÷5

x=28

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)