Question

y=-5 and x=3 Write a variation equation for both.

Answer 1

Y varies directly as x means y = kx.

So, plug in y = -18 and x = -2 to find k

-18 = k(-2)
-18 = -2k
9 = k

So, your general model that will work for any x and y is: y = 9x.

If x is 20, then y = 9(20) = 180.

For your first question. y varies inversly as x means y = k/x

So, plug these in again to find k.
5 = k/3
15 = k.

y = 15/x

Answer 2

There also is another problem that goes along with it. x:1 5 10 and 15
y: 30 6 3 and 2.

Answer 3

i dont under stand

Answer 4

Uhm, okay for the second question it wants you circle the number that was the constant? I don't know im confused myself..