Question

y = -5 when x = 3

How do I find the constant variation and then the value of y when x = -5 ?

Answer 1

youd have to know how x and y relate to each other first

Answer 2

that is why we need a constant of variation; and how they vary; directly, jointly, etc ...

Answer 3

Explain please?

Answer 4

without being told the relationship between y and x; there is no good grounds with which to determine a "constant of variation".

spose they are inversely related; then

5 = k/3 ; such that k = 15

y = 15/x ; when x = -5, y = -3

if they are directly related, then:

5 = k3; and k = 5/3

y = 5x/3 ; when x=-5, y = -25/3

there is no good way to determine the relationship between y and x in order to solve the problem with any degree of confidence

Answer 5

y and x could have a linear relationship such that:

y = x + 2

5 = 3 + 2

y = -5 + 3
= -2

Answer 6

So what would be the constant variation of y = -2 when = 2 ?
I have to figure out if it's a direct variation first right ?

Answer 7

you would definantly have to figure out what the relationship between x and y is first; yes