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01-12-2016
Mathematics

contestada

Which ordered pair is the solution to the system of equations?
2x−y=−5
x+3y=22

A.(1, 7)
B.(4, 9)
C.(7, 19)
D.(8, 21)

Respuesta :

wizard123 wizard123

01-12-2016

Multiply top equation by 3

---> 6x -3y = -15
---> x + 3y = 22

Add equations together, this way the y terms will cancel themselves out.

---> 7x = 7

Solve for x

x = 7/7 = 1

Therefore the answer must be A) (1,7)

Answer Link

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