Two mark example problems III — task. Mathematics State Board, Class 9.

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1. Solve by cross multiplication method:

$3x + 5y = 21$ :

$-7x - 6y = -49$ .

Answer:

$x =$

$y =$

2. Check the value of

$k$ for which the given system of equations

$kx + 2y = 3$ ;

$2x - 3y = 1$ has a unique solution.

Answer:

The value of

$k$ is

$k \neq \frac{-4}{3}$
$k \neq \frac{4}{3}$
$k = \frac{-4}{3}$
$k = \frac{4}{3}$

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