Wolfie215 Wolfie215
  • 25-02-2019
  • Mathematics
contestada

if y varies directly with X and Y equals 35 when x equals 5 find X when y equals -7​

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KhaRNate
KhaRNate KhaRNate
  • 25-02-2019

y varies directly with x means y = kx, where k is the constant value. To find x when y = -7 first we have to find k, using y = 35 and x = 5

y = kx

35 = k(5)

35/5 = k

k = 7

Find x when y = -7. Remember k is constant and it stays 7.

y = 7x

-7 = 7x

-7/7 = x

x = -1

Answer: x = -1 when y = -7

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