SOLUTION: If y varies directly as x, find the direct variation equation for the situation. y = 27 when x = 21 A. y = (9 / 7) x B. y = x + 6 C. y = 3x D. y = (7 / 9) x

Algebra ->  Test -> SOLUTION: If y varies directly as x, find the direct variation equation for the situation. y = 27 when x = 21 A. y = (9 / 7) x B. y = x + 6 C. y = 3x D. y = (7 / 9) x       Log On

 

Hi

*Note: When Quantities vary Directly,they are related by the relationship:

  k being  the constant of proportionality.

  y = 27 when x = 21 

  27 = k*21

  27/21 = k

 y = (9/7)x