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OpenStudy (mikehowk57):
suppose y varies directly with x. If x = 18, when y = 10 what is the value of x when y = 12
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hartnn (hartnn):
y varies directly with x so, y = kx given that x= 18, y= 10, can you plug these in y = kx and get the value of k ??
OpenStudy (mikehowk57):
i got k = 11.6? but doesnt work.
hartnn (hartnn):
because we need the value of 'x' ! not k
OpenStudy (mikehowk57):
still confused
hartnn (hartnn):
y = kx 10 = 18k k = 10/18. y = kx 12 = (10/18) x x = 12*18/10 = ..?
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OpenStudy (mikehowk57):
21.6!! thank you!!
hartnn (hartnn):
welcome ^_^
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