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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