sakinaray sakinaray

04-11-2020
Mathematics

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Solve the system of equations x+y=-1 and 5x-7y=79 by combining the equations.

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sqdancefan sqdancefan

04-11-2020

9514 1404 393

Answer:

(x, y) = (-6, -7)

Step-by-step explanation:

Multiply the first equation by 7 and add that to the second.

7(x +y) +(5x -7y) = 7(-1) +(79)

12x = 72

x = 6

y = -1 -x = -1 -6 = -7

The solution is (x, y) = (6, -7).

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