addison61 addison61

13-11-2018
Mathematics

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Find direct variation if y=-6 when x=9, find x when y=-3

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wegnerkolmp2741o wegnerkolmp2741o

13-11-2018

direct variation

y =kx

substitute y and x to find k

-6 = k(9)

divide by 9

-6/9 =k

k = -2/3

y = -2/3 x

now substitute y =-3 to find x

-3 = -2/3 x

multiply by -3/2 on each side

-3 * -3/2 = -3/2 * -2/3 x

9/2 = x

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