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anonymous
 3 years ago
Determine whether y varies directly with x. If so, find the constant of variation k.
3y = –7x – 18
anonymous
 3 years ago
Determine whether y varies directly with x. If so, find the constant of variation k. 3y = –7x – 18

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agent0smith
 3 years ago
Best ResponseYou've already chosen the best response.2For the constant of variation, we need it to look like y = kx. Let's divide both sides of 3y = –7x – 18 by 3, to get \[y = \frac{7 }{ 3 }x –\frac{ 18 }{3 }\] Try comparing \[y= kx \]to\[y = \frac{7 }{ 3 }x –\frac{ 18 }{3 }\]

agent0smith
 3 years ago
Best ResponseYou've already chosen the best response.2But notice that we have\[ y = \frac{7 }{ 3 }x –\frac{ 18 }{3 } \] Does it look like y=kx? or y=kx minus 18/3?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0no they don't so its D

agent0smith
 3 years ago
Best ResponseYou've already chosen the best response.2For constant of variation, you only want y = kx, not y = kx plus or minus some number.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0so there is no constant of variation its no

agent0smith
 3 years ago
Best ResponseYou've already chosen the best response.2Correct :) *If* it was just \[y = \frac{7 }{ 3 }x\] then it would be in the form y = kx.
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