if y varies directly with x and y = 42 when x =4

if y varies directly with x and y = 42 when x =4, what is the constant of variation expressed in decimal form?
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3 Answers

y = 42, x = 4

42 = 4z

z = 42/4 = 10.5

by Level 10 User (55.7k points)
y=kx, 42=k(4), so 42/4 is 8 and 1/2, which is 8.5. So, the constant of variation is 8.5.
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if the value of y varies directly with x , and y=4 when x=10, what is y when x=35
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