Question

Suppose y varies directly with x, and y =14 when x = -4. What is the value of y when x = -6

Answer 1

y varies directly with x means that y = cx
lets figure out c by plugging in the x y combination that we know
y = cx
14 = c*(-4)
Solve that for c. What do you get?

Answer 2

Using that formula I get 10

Answer 3

14 = c*(-4)
Divide both sides by -4, you get
c = -14/4 or -7/2
so....y = (-7/2)x is our formula
Now plug in -6 for x in our new formula to get y when x = -6

Answer 4

(-7/2)(-6)=42/2=21

Answer 5

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