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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