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Question

The straight line passes through the points (0,0), (-1,1) and (1,-1) has an equation:


A

2-x=3y

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B

y=x

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C

2x-y=0

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D

x+y=0

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Solution

The correct option is D

x+y=0


We have to check whether the given points satisfy the equations.

Putting all the points in the fourth equation:

x+y=00+0=0-1+1=01-1=0

As all the given points satisfy the equation x+y=0.

We can see that the given points do not satisfy the other options.

Hence, option (D) is correct .


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