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The graph of the equation x + 2y + 3 = 0  is perpendicular to the graph of the equation ax + 2y + 3 = 0. What is the value of a?

 

I don't understand what to do, please help me.

 Jun 24, 2018
 #1
avatar+169 
+1

Never mind I got it. It's -4

 Jun 24, 2018

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