Hi  

Find y such that line AB and line CD are parallel

parallel Lines have same slope:  

m = m =

A(-12,-6) and 

B( 8 , 9)  m = -15/-20 = 3/4

|

C(6,6) and 

D(14,y)   m = 

4(6-y) = -24

24 -4y = -24

48 = 4y

y = 12







 

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