If Y Varies Directly as X, Find a Linear Function $$y = 18 \text { when } x = 21$$

question 192

Multiple Choice

If y varies directly as x, find a linear function which relates them.
- $$y = 18 \text { when } x = 21$$

• A) \(f ( x ) = 3 x\)
• B) \(f ( x ) = \frac { 7 } { 6 } x\)
• C) \(f ( x ) = \frac { 6 } { 7 } x\)
• D) \(f ( x ) = x - 3\)

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