Question 68473
Two nonvertical lines have the same slope if and only if they are parallel.
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If you have two nonvertical lines that are parallel, the slopes are the same
From these choices C and D have the same slopes so these two lines are parallel.
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A) Y= 5/3x +4  b) y= -3/5x -7   c) y=2x+8   d) y= 2x-4 

here is the graph 
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{{{graph (300, 300, -8, 8, -6, 10, 2x+8, 2x-4)}}}

<br>The red line shows the graph of y=2x+8
The green line shows the graph of y= 2x-4
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{{{graph (300, 300, -8, 8, -6, 10, (5/3)x +4, (-3/5)x -7)}}}
The red line in this graph show Y= 5/3x 
GReen y= -3/5x -7