Question:if y varies directly with x write an equation that relates x and y. im not really sure what this means or how to do it so thankyou for the help :).

x= -8 y= 5

When two variable quantities have a constant (unchanged) ratio, their relationship is called a direct variation.
It is said that one variable "varies directly" as the other.

The constant ratio is called the constant of variation.

The formula for direct variation is y = kx,
where k is the constant of variation.
"y varies directly as x"
Solving for k: k = y/x
(y = numerator; x = denominator)

So we have: y=kx
5=k(-8)
k=5/-8

More examples of direct variation... hmmm... how about the age of a teenager and his height? As he gets older, he gets taller. As the number of hours he studies goes up, so do his grades.

Indirect variation could be something like mountain climbing. The temperature on the mountain FALLS as the altitude INCREASES. Perhaps our teenager is into video games... as the number of hours of playing increases, the number of hours of sleep he gets at night decreases.

x= -8 y= 5 ok x will equal -8 and y will equal 5 what you have to do is how many numbers -8 needs to become 5 the answer is 9 DUH! DUH!

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