SOLUTION: y varies inversley with x, and x = -12 when y = 5. Find the inverse variation equation and use it to find the value of x when y = 10 (I think its -12... what do you think?)

Question 323807: y varies inversley with x, and x = -12 when y = 5. Find the inverse variation equation and use it to find the value of x when y = 10
(I think its -12... what do you think?)
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
"y varies inversley with x" means that where 'k' is some number.

Plug in x = -12 and y = 5 to get and solve for k to get

So the equation is . Now plug in y=10 to get , multiply both sides by x to get and divide both sides by 10 to solve for x:

So when
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