01-06-2015
Mathematics

contestada

Which ordered pair is the solution to the system of equations?
-3x+4y=-20
x+4y=-4
A.
(8, 1)

B.
(−12, 2)

C.
(−4, −8)

D.
(4, −2)

Respuesta :

hunaifirst hunaifirst

01-06-2015

x+4y=-4
x=-4-4y

-3(-4-4y)+4y=-20
12+12y+4y=-20
16y=-20-12
y=-32/16
y=-2

x=-4-4(-2)
x=-4+8
x=4

D.(4,2)

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