Question

Variables y and x have a proportional relationship, where y = 18 when x = 2.

What is the value of x when y = 36?
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X=

Answer 1

x = 324

Explanation:

y=Kx

• make k the subject of formula

=> Kx = y

=> k = y/x

• add the value of y = 18 when x = 2.

=> k = 18/2

• divide 18 by 2

=> k = 9

What is the value of x when y = 36?

=> x = Kx

• substitute k equals to 9 and from the question y equals to 36 into this equation

=> x = 9(36)

• multiply 36 by 9

=> x = 324