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Elena-2011 [213]
3 years ago
12

Solve the system of equations x - y = 12 and x + 7y = -20 by combining the equations.

Mathematics
2 answers:
svetoff [14.1K]3 years ago
8 0

Answer:

x= 8, y= -4

Step-by-step explanation:

You can subtract one equation by another to eliminate x

(x-y)-(x+7y)=12-(-20)

-8y = 32

y= -4

Substitute y =  -4 in the first equation:

x-(-4) = 12

x =8

iogann1982 [59]3 years ago
7 0

Answer:

x=16, y=-4

Step-by-step explanation:

-1(x-y=12)

x+7y=-20

-x+y=-12

x+7y=-20

8y=-32

y=-4

x-4=12

x=16

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