Question

Suppose y varies directly with x Write a direct variation equation that relates x and y. Then find the value of y when x = 12 y=7 when x=4​

Answer 1

y = 21

Explanation:

given y varies directly as x then the equation relating them is

y = kx ← k is the constant of variation

to find k use the condition y = 7 when x = 4 , then

7 = 4k ( divide both sides by 4 )

`(7)/(4)` = k , that is

k = 1.75

y = 1.75x ← equation of variation

when x = 12 , then

y = 1.75 × 12 = 21