Actually, if is halved then you need to replace with , which gives
.
Since you end up with or of what you started with, that means the percentage decrease is .
Hello everyone. I have an algebra question:
Given that y varies directly as the cube of x, find the percentage decrease in y if x is halved.
Since is in direct proportion with ,
let , where k is a constant.
If x is halved, it would be .
But it doesn't solve the problem.
I wonder how the percentage can be calculated when there are no values for and ...