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I y varies directly with x and y = 16 when x = 4, then find the constant of variation, k.

 

 

Use k in the previous question to find the value of y when x = 7.

 Apr 1, 2019
edited by SmartMathMan  Apr 1, 2019
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They vary directly so     y = kx        (if they varied INdirectly it would be   y = k/x)

y = kx     divide both sides by x

 

y/x = k    Now sub in the values given to find k

16/4 = k = 4

 

 

Second part:    y = kx        y = 4x        y = 4(7) = 28 when x = 7

 Apr 1, 2019
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Thank you for your help, keep doing what you're doing.  :-)

SmartMathMan  Apr 1, 2019

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