If the value of y varies directly with x and y=-1 when x=3, find y if x=9
Mathematics · Middle School · Tue Nov 03 2020
Answered on
Given the statement
The value of y varies directly with x and y=-1 when x=3
Find y if x=9
Solution:
In order to determine y when x =9, we must first find the common ratio between the two by which they vary, to do so, we can divide the value of x with the value of y.
= 3 / -1
Common ratio: -3
Now we must divide the value of x by -3, in order to find the value of y.
= 9 / -3
= -3
Final answer:
y= -3