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Anonymous Anonymous
  • 28-10-2015
  • Mathematics
Answered

If y varies directly with x, write an equation for the direct variation. Then find each value.

  1. If y= - 12 when x=9, find y when x= - 4
  2. Find y when x=10 if y= 8 when x= 20
  3. If y= -6 when x= -14, find x when y= -4

Verified Answer :

TSO
TSO TSO
  • 02-11-2015

1)
y = kx
-12 = k(9)
k = -4/3

y = (-4/3)(-4)
y = 16/3

2)
y = kx
8 = 20k
k = 2/5

y = (2/5)(10)
y = 4


3)
y= kx
-6 = k(-14)
k = 3/7

-4 = (3/7)x
-4(7/3) = x
x = -28/3

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