What is x and y equal in: -2X-y=3 and x+2y=4 (find x and y using elimination)

asked Sep 6, 2018 164k views

2 votes

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4 votes

-2x-y=3 ...(1)
x+2y=4 ...(2)
multiply (2) by 2 and add to (1)
-2x-y+2x+4y=3+8
3y=11
y=11/3
from (2)
x=4-2y=4-2(11/3)
or x=4-(22/3)
=(12-22)/3=-10/3

Bozena answered Sep 12, 2018

6.4k points

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