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douglas12
y varies directly as to x. when x = -1.5 y = 9. Find y when x = 6
http://openstudy.com/study#/updates/51eae087e4b0d999840f0ed6
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
hmmm, let's see 9 = k(-3/2) what would that give you cross multiplying?
\(\bf 9 =k \times -\cfrac{3}{2} \implies 9 = \cfrac{3k}{-2}\) try cross multiplying :)