00:01
For this question we are given two sets, g and h, and then we're also given a relation between them which we're calling v, and v is the set of ordered pairs in the cartesian product such that x minus y over 4 is an integer.
00:16
So there are quite a few questions to this problem.
00:20
We're going to do them slightly out of order.
00:23
So what we're going to do first is we want to find the ordered pairs that are in v.
00:30
So we're going to effectively answer part b first, and in the process that'll also give us a.
00:38
So what we're going to do, i'm going to write out the nine elements that are in the cartesian product.
00:46
So i'm going to look at all the ordered pairs that we can make.
00:56
So we should have again nine in total.
01:16
There they are.
01:26
Okay, and now we're going to do a quick check on whether or not these belong to the set v.
01:32
So again you're doing x minus y over 4, and we see if it's an integer.
01:36
So let's see, negative 2 minus 4 is negative 6, does not divide by 4.
01:42
So that one's no good.
01:45
Negative 2 minus 6 is negative 8.
01:49
That one checks out.
01:51
Negative 2 minus 8 is negative 10.
01:55
That one does not work.
01:58
All right, what else? 0 minus 4, yep.
02:02
0 minus 6, no good.
02:08
0 minus 8, that works...