If y varies directly with x, y=12 when x=15. Find y when x=2

Answer 1

If y varies directly with x ....y = k x, where k is a constant of variation. To find y when x=2 forthis direct variation relationship we need to find the constant o variation, k.

So using given example y=12 and x = 15...

12 = k (15)

12/15 = k

k= 4/5

So the direct variation equation

y = 4/5 x can now be used to find y when x = 2

y = 4/5 (2)

y= 8/5