Find an equation of variation in which y varies directly as x and y equals=36 when x equals=9. Then find the value of y when x equals=20.

Question

Find an equation of variation in which y varies directly as x and y equals=36 when x equals=9. Then find the value of y when x equals=20. y=?

Answer 1

y = kx

36 = k(9)

k = 4

 

y = 4x

 

now when x=20, what's y?

 

Very simple! Learn this!