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What is found by comparing the ratios of (a) and (b) in the equations (11x+6y=35) and (5x+3y=17)?

Answer and explanation

Correct answer: (11/5 \ne 6/3) so one unique solution

The equations in this item are the same as in the preceding comparison, and the relevant rule is unchanged. When the ratio of the x coefficients differs from the ratio of the y coefficients, the two lines have different slopes. Two lines with different slopes intersect once, so the pair has exactly one solution. Equality of both variable ratios would be needed for parallel or coincident-line tests.

Calculate the ratios: \\(11/5=2.2\\) and \\(6/3=2\\). Since these values are unequal, \\(11/5\\ne6/3\\). The lines cannot be parallel with the same slope, and they cannot be the same line. They meet at one point, so the system has a unique solution. Therefore option C agrees with the mathematics.

Related tags

Linear EquationsHardRatio ComparisonUnique Solution

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