00:01
Okay, let's write the equation that represents this situation.
00:05
So, the amount of money that brian spends, they want us to represent that as e.
00:11
So, we don't know how many salads he buys.
00:16
We're going to call that s, but it's $5 per salad, and in math, per means times.
00:23
So that's $5 times s.
00:28
You could also just say 5s.
00:31
And, same thing for pizza.
00:34
It's going to be $2 per pizza.
00:37
But we could just say 2p, since it's .00.
00:41
So this is the equation that represents how much money he has spent.
00:47
So now we're going to rearrange the equation so that it's solved for p.
00:54
So, before we can get p by itself, we have to get 2p by itself.
01:03
So we'll subtract 5s from both sides.
01:09
So e minus 5s equals 2p.
01:16
And then we're going to divide everything by 2.
01:22
So p equals e minus 5s all over 2, or if you prefer, you can show those separately.
01:33
E over 2 minus 5s over 2.
01:38
Alright, third part of this question says he has $40 to spend on salad and pizza.
01:50
So e is $40.
01:54
Complete the following table with values that make the equation true.
02:00
So i can use this equation to help me here.
02:09
So, the first one says if he buys 0 salads, how many pizzas? so p equals 40 over 2.
02:21
We'll put in a 0 for salads, so that's going to be 20 minus 0, or 20.
02:32
So let's build this table over here.
02:36
So, 40, this is my dollars, this is my salads, this is my pizza...