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1.) y is directly propotional to x and y=7 when x=21, tind the constant of variation.

2.) z varies directly as w and z=50 when w=40, find the equation of variation.​

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Step-by-step explanation:

1.) y is directly propotional to x and y=7 when x=21, tind the constant of variation.

y = kx

7 = k21

k = 1/3

2.) z varies directly as w and z=50 when w=40, find the equation of variation.

z = kw

50 = k40

k = 50/40

k = 5/4

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