-7y + 2 = -75
Step by Step

11

Step-by-step explanation:

2+75= 7y

77 = 7y

77/7 = 7y/7

y = 11

y=11

Step-by-step explanation:

1. Subtract 2 from each side of the equation

-7y = -77

2. Divide each side of the equation by -7

y = -77 / -7

step-by-step explanation: h: (- 3, 6)

m: (1, - 2)

o: (7, 6)

r: (- 9, - 2)

midpoint of hm: (- 1, 2)

midpoint of or: (- 1, 2)

therefore, b is the midpoint of both diagonals bisect each other !

to prove the diagonals are perpendicular, show that the product of the slopes = - 1

i'm pretty sure it's 477,585,296, but perhaps my math is incorrect.