Multiple choice questions III — task. Mathematics State Board, Class 9.

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1. Which condition does not satisfy the linear equation \(ax + by + c = 0\)?

\(a \neq 0\), \(b \neq 0\)
\(a = 0\), \(b \neq 0\)
\(a \neq 0\), \(b = 0\)
\(a = 0\), \(b = 0\), \(c \neq 0\)

2. Which of the following is not a linear equation in two variable?

\(0x + by + c = 0\)
\(ax + 0y + c = 0\)
\(ax + by + c = 0\)
\(0x + 0y + c = 0\)

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

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