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If x and y are in direct proportion, then x1 by y1 equals:
Ax2 less y2
Bx2 by y2
Cy2 by x2
Dx2 times y2
Answer & Solution
Correct answer: B. x2 by y2
1. The ratio is the same for every pair of values.
2. So the first pair's ratio equals the second pair's.
3. That gives x1 by y1 equals x2 by y2.
4. The answer is x2 by y2.
_Source: NCERT Class 8 Mathematics, Ch 11 'Direct and Inverse Proportions'_
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