Question

If x and y are in direct proportion and y is 45 when xx is 15, find y when x is 4.

Answer 1

y = 12
thats the answerr

Answer 2

y = 12

Explanation:

the equation is

y = 3x

You find the constant or proportionality by put y/x

(15,45) is in the form (x,y) The x is 15 and the y is 45. Put this in the form y/x and you get 45/15 or 3. 3 is the constant of proportionality.

y = 3x

y = 3(4)

y = 12