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\(Given\ that\\ \begin{align*} 5a - 7b + 3c &= 19, \\ 2a - 4b + c &= 77,\end{align*}\\ determine\ the\ value\ of\ a+b+c.\) 

Hellp me, dont give me all of the answer, just give me a nudge.

 Jun 22, 2019
edited by CuteDramione  Jun 22, 2019
 #1
avatar+7711 
+1

Let's call the first equation (1) and the second equation (2).

Now, consider (1) - 2*(2) and you are done.

 Jun 22, 2019
 #2
avatar+1044 
+1

So basically he means that you have to use elimination.

 

Dont actually solve for A B C just get it where you have one equation and it is a + b + c = ?

 Jun 22, 2019
 #3
avatar+75 
-3

:D thx both of u

CuteDramione  Jun 22, 2019

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