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For a certain value of the system

3a + 4b = 7

6a + 4b = k - 4b + 2a

 

has infinitely many solutions What is k?

 Feb 21, 2022
 #1
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Here's a start...

 

In the equation 3a + 4b = 7, you can multiply through by 3 to get 9a + 12b = 21.

Next, in the equation 6a + 4b = k - 3a - 8b you can start by simplifying to 4a + 8b = k.

 Feb 21, 2022

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