Question

y varies directly as to x. when
x = -1.5 y = 9. Find y when x = 6

Answer 1

http://openstudy.com/study#/updates/51eae087e4b0d999840f0ed6

Answer 2

direct variaion

y = \(\bf k\)x

what's "k"?
well, when x = -3/2, y = 9, thus
9 = \(\bf k\)(-3/2)
solve for "k" to see what "k" is

Answer 3

k is -3/2

Answer 4

hmmm, let's see
9 = k(-3/2)

what would that give you cross multiplying?

Answer 5

-1.5

Answer 6

\(\bf 9 =k \times -\cfrac{3}{2} \implies 9 = \cfrac{3k}{-2}\)

try cross multiplying :)