## anonymous 2 years ago y varies directly as to x. when x = -1.5 y = 9. Find y when x = 6

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1. anonymous
2. anonymous

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

3. anonymous

k is -3/2

4. anonymous

hmmm, let's see 9 = k(-3/2) what would that give you cross multiplying?

5. anonymous

-1.5

6. anonymous

$$\bf 9 =k \times -\cfrac{3}{2} \implies 9 = \cfrac{3k}{-2}$$ try cross multiplying :)