What is the missing reason in the proof

The correct option is 1.

Step-by-step explanation:

Given information: x║y, w is transversal line.

From the given figure it is clear that

                     (Definition of vertically opposite angles)

                     (Definition of corresponding angles)

According to the transitive property of congruent angles, if ∠1 ≅ ∠2 and ∠2 ≅ ∠3, then ∠1 ≅ ∠3.

Using transitive property of congruent angles, we get

The missing reason is transitive property, therefore the correct option is 1.

b.) divide by -5.

step-by-step explanation:

ad = ae + ed = y + 7

similar triangles therefor

ac/ab = ad/ae

6/4 = (y + 7) / y

cross multiply

6y = 4(y + 7)

6y = 4y + 28

2y = 28

y = 14

step-by-step explanation: