X-2y=7 1 formula

1-3x = y-1/2 2 formula

1 formula: x=2y+7.

Bring it into Formula 2 to get:1-6y-21= y-1/2.

-40- 12y=y- 1

13y=-39

y=-3

x=2y+7=-6+7= 1

Solution: x= 1 y=-3.

3x-y=5 1 formula

5x+2y = 23 2 formula

1 formula; Bring Y=3x-5 into Equation 2 and get:

5x+6x- 10=23

1 1x=33

x=3

y=3x-5=9-5=4

Solution: x=3 y=4

2.

The diagonal angles of AOC and BOD are both 28 degrees, and OD bisects the angle BOE, so the angles BOD and EOD are equal to 28 degrees, and the angle BOE is 56 degrees. AOE angle and BOE angle are complementary, so AOE angle is 180 -56 degrees = 124 degrees. Because the angle EOA is bisected, the angle e of is half of the angle EOA.