Direct variation between a and b is expressed as _____?
- a = b
- a × 1/a
- a × b
- None of these
Explanation
In direct variation, two variables increase or decrease together, and are related by a = kb, where k is a constant.
If k = 1, then a = b, which expresses direct variation.
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- 2x² + 4 = 9x
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