Question

Write the equation of direct variation for x = -3, y = 4.

Answer 1

How do u do this plz help

Answer 2

In order to write a variation equation, we have to know how it varies, which your problem will specify. Does your problem let us know that y varies directly with x?

Answer 3

yes

Answer 4

It varies

Answer 5

If so, the variation equation of y varying directly with x is y=kx
\[y=kx\]
\[4=k(-3)\]
\[4=-3k\]
\[k =-\frac{ 4 }{ 3 }\]

Variation equation is
\[y=-\frac{ 4 }{ 3 }x\]

Answer 6

thx man your a big help

Answer 7

No proble, but remember that "it varies" is irrelevent. You need to know if it varies directly, inversely, jointly, etc.

Answer 8

that's where you know how to get the formula.
y varying directly with x is y=kx
y varying inversely with x is y=k/x