Question

For the equation -4y=8x, what is the constant of variation?
A. -4
B. -2
C. 1
D. 2

Answer 1

Since k is constant (the same for every point), we can find k when given any point by dividing the y-coordinate by the x-coordinate. For example, if y varies directly as x , and y = 6 when x = 2 , the constant of variation is k = = 3 . Thus, the equation describing this direct variation is y = 3x .

http://www.sparknotes.com/math/algebra1/variation/section1.rhtml

Answer 2

What is k where do you get k??

Answer 3

K is short for "The constant of variation"

Answer 4

I'm still not understanding it I see how you get 3x but what does 3x even do?

Answer 5

@FortyTheRapper

Answer 6

Very confuseing haha

Answer 7

In his example, it's just basically saying for a given X value, the y value will always be 3 times that number, no matter what the number plugged in is