$\"\"$

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The expression is $\"\"$ .

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The point is $\"\"$ \ \

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$\"\"$ (Substitute 3.5 for x and 6.8 for y)

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ ) $\"\"$

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So the point $\"\"$ is a not solution of $\"\"$ .

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