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For a certain value of k, the system

3a + 4b = 7,

6a + 8b = k

has infinitely many solutions (a,b). What is k?

 Sep 26, 2021
 #1
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What is k?

 

Hello Guest!

 

\(3a + 4b = 7\ |\ \times 2\\ \ \\ 6a+8b=14 \\ \underline{6a + 8b = k}\ |\ subtract \)

           \(0=14-k\ |\ +k\\ \color{blue}k=14\)

laugh  !

 Sep 26, 2021

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