Which of the following equations have a unique solution?

x + 6 = 8

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2x + 7y = 18

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x - 2y = 6

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y = 3x

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Solution

The correct option is A
x + 6 = 8

x + 6 = 8 $\Rightarrow$ x = 2
Hence, it has only one solution.

All the other equations are linear equations in two variables, which have infinitely many solutions.

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