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Svetradugi [14.3K]
2 years ago
12

Solve the system of equations x + y = 4 and -9x + 7y = -84 by combining the equations.

Mathematics
1 answer:
Yanka [14]2 years ago
6 0

Answer:

x = 7

y = -3

Step-by-step explanation:

x + y = 4                 (Multiply this by 9)

-9x + 7y = -84

9x + 9y = 36

-9x + 7y = -84

16y = -48

y = -3

x + y = 4  

x - 3 = 4

x = 7

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