Which of the following pairs of equation...

Which of the following pairs of equations represents a pair of parallel lines ?

A

`7x+2y-17=0`

B

`4x+3y+7=0`

C

`{:(3x+5y=17=0),(21x+6y-34=0),(x+2y+7=0):}`

D

`{:(6x+15y+21=0),(8x+6y+14=0),(4x+10y+14=0):}`

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