airsixes12 airsixes12

18-03-2020
Mathematics

contestada

Solve by elimination:
-9x-4y=-20
5x+4y=4

Respuesta :

nate4385 nate4385

18-03-2020

Eliminate the y by making them zero.

-9x=-20
5x=4

Combine

-4x=-16

Divide each side by 4 to put the x alone

-4x/4= -16/-4

X=4

Plug x=4 back into one of the equations. It does not matter

5(4)+4y=4

20+4y=4
-20 -20

4y=-16
Divide by 4

Y=-4

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