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What is the solution status of (4x+9y=2) and (8x+18y=7)?

Answer and explanation

Correct answer: No solution

Compare the coefficients of the two equations. The second equation has coefficients 8 and 18, which are twice 4 and 9, the corresponding coefficients in the first equation. However, twice the first right-hand side is \\(2\\times2=4\\), not 7. Thus, the left sides are proportional but the constants are not.

The equations therefore have the same slope but different positions. Their graphs are distinct parallel lines, so they never meet and no ordered pair satisfies both equations simultaneously. This is an inconsistent pair, giving option B. A unique solution would require different slopes, while infinitely many solutions would require the constant ratio to match as well.

Related tags

Class10Linear-EquationsSolvability

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