-9(y+12)=4(-7y-8)
Solve for y

-9(y + 12) = 4(-7y -8)

Use the distributive property:

-9y - 108 = -28y -32

Add 32 to both sides:

-9y - 76 = -28y

Add 9y to both sides:

-76 = -19y

Divide both sides by-19

Y = 4

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

step-by-step explanation:

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