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Katieann16
 2 years ago
y varies directly with x, and y = 2 when x = 5.
What is the value of x when y = 15?
Katieann16
 2 years ago
y varies directly with x, and y = 2 when x = 5. What is the value of x when y = 15?

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jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1y varies directly with x so this means y = kx where k is some fixed number

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1we are told that y = 2 when x = 5 so y = kx 2 = k*5 solve for k

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1when you solved for k, what did you get

Katieann16
 2 years ago
Best ResponseYou've already chosen the best response.1wait how do i solve for k

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.12 = k*5 divide both sides by 5 to isolate k

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1you divided in the wrong order

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1good, so y = kx turns into y = 0.4x

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1now you want to find x when y = 15, so y = 0.4x 15 = 0.4x now solve for x

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1you nailed it you can also represent 37.5 as the fraction 75/2

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1so x = 37.5 or x = 75/2

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1you're welcome
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