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 one year ago
y varies directly with x, and y = 2 when x = 5.
What is the value of x when y = 15?
 one year 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
 one year 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
 one year 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
 one year ago
Best ResponseYou've already chosen the best response.1when you solved for k, what did you get

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

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

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

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

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

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