Suppose y varies directly with x. Write a direct variation equation that relates x and y.

y=10.4 when x=4

y=3.4x*
y=3.8x
y=3.2x
y=2.6x

I honestly don't understand this subject at all. Could you explain it to me please?

I don't really understand any of it. What is a direct Variation, how do I find it?

http://www.mathwords.com/d/direct_variation.htm

To write a direct variation equation that relates x and y, you need to determine the constant of variation, often denoted as k. The equation can then be written in the form y = kx.

Given that y varies directly with x, we can use the given values to find the constant of variation. When x = 4, y = 10.4.

To find k, we divide the value of y by the value of x: k = y/x.

In this case, k = 10.4/4 = 2.6.

Therefore, the direct variation equation that relates x and y is y = 2.6x.

y/x = 10.4/4 = 2.6

y = 2.6x

Geez! 3.4*4 = 13.6

Maybe you could show your work, so we can see where you are taking a wrong turn. Or are you just guessing so we'll think you tried?

What part of this don't you understand?

y/x = 10.4/4 = 2.6

y = 2.6x