SweetSweet12 SweetSweet12

09-02-2017
Mathematics

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

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surjithayer surjithayer

09-02-2017

-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

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