Question

x+2y=0 x-y elimination subsition
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Answer 1

Answer:

x is equal to minus 2 y, so x minus y is equal to minus 2 y minus y is equal to minus 3 y

Answer 2

Answer:

x+2y=0 →i

x-y=0→ii

- + -

_------------------------- cut the x

3x=0.

,x=0

now putting the value of x in eq I

0+2y=0.

2y=0.

y=0