If y is proportional to x and y = - 15 when x = - 20, what is the value of x when y = 12?

Question

Alayna Scott

Mathematics

7 March, 22:23

If y is proportional to x and y = - 15 when x = - 20, what is the value of x when y = 12?

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Answers (1)

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Deegan Costa · Answer 1

Y = k·x

if y = - 15 and x = - 20

⇒ - 15 = k· (-20)

⇒ k = - 15/-20

⇒ k = 3/4

What is the value of x when y=12?

x = ?

k = 3/4

y = 12

y = kx

⇒ x = y/k

⇒ x = 12 / (3/4)

⇒ x = 12· (4/3)

⇒ x = 16