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4x= y

Q: Find an equation of variation where y varies directly as x and y equals 28 when x equals 7?

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y = 10x

a varies directly as b and a = 12 when b = 4. What is the constant of variation?

y = 3x y = 3*19 = 57

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If P varies directly with the square of Q then the equation would be in the form of P = kQ2, where k is the constant of variation so the new equation would be: P = 6Q2, so when Q = 12 we have P=6*122, or P = 864

Related questions

Find an equation of variation where y varies directly as x. One pair of values is y = 80 when x = 40

y = 10x

a varies directly as b and a = 12 when b = 4. What is the constant of variation?

40

57

y = -5

15

direct variation: y = kx y = kx k = y/x = 0.8/0.4 = 2

y = 3x y = 3*19 = 57

y = kx: 10 = 37k so k = 10/37 and y = 10x/37

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