vibequeen2001 vibequeen2001

06-01-2017
Mathematics

contestada

Solve the following system of equations: 5x + y = 9 3x + 2y = 4 (−2, 5) (1, 4) (2, −1) (4, −4)

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kirstenrewis kirstenrewis

06-01-2017

Plug each set in until both equations are correct. The answer is (2,-1)

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djsdoodle djsdoodle

06-01-2017

Multiply first equation by 2:
10x + 2y = 18
Subtract the second equation from this so that the 2y terms cancel:
10x - 3x = 18 - 4
7x = 14
x = 2
Plug into first equation to find y:
5(2) + y = 9
10 + y = 9
y = -1
The answer is (2,-1)

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