UPSKILL MATH PLUS

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1. Which condition does not satisfy the linear equation \(ax + by + c = 0\)?
 
2. Which of the following is not a linear equation in two variable?
 
3. The value of \(k\) for which the pair of linear equations \(4x + 6y - 1 = 0\) and \(2x + ky - 7 = 0\) represents parallel lines is