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# post#1000000000000000000000000000000000000000

-3
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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
+7725
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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
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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
+75
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:D thx both of u

CuteDramione  Jun 22, 2019