SOLUTION: Which equations show a direct variation between x and y when solved for y? 3/4y= 6x y=2/5x-2/5 y=27x 2y=x

Question 937399:
Which equations show a direct variation between x and y when solved for y?
3/4y= 6x
y=2/5x-2/5
y=27x
2y=x

Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
direct variation equation is y = kx

first equation satisfies that because 2/3y = 6x becomes y = 8x when you solve for y.

second equation does not.

third equation does.

fourth equation does.

it looks to me like all of them are direct variation equation except the second one.

in the first equation, k = 8
in the third equation, k = 27
in the fourth equation, k = 1/2.

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