00:01
Okay, we're given that x varies directly with the square of y and inversely with z.
00:11
Okay, so it asked, what happens if y is halves? what happens to x? okay, and if y is quartered, so y is multiplied by a fourth, what happens to x? there's a question mark up there.
00:36
Okay, so we're not changing z, so that's not going to really affect x.
00:41
It's only asking about what happens if we change y.
00:44
So if we change y, we can kind of write an equation for this.
00:50
So we'll have x is related to y squared.
00:57
So if y gets bigger, x will get bigger.
01:00
If y squared gets bigger.
01:02
So if we cut y in half, that means we're cutting the square of y into a fourth...