00:01
So we're going to be solving for two variables with two equations.
00:04
And so we're going to let x be the beef and y be the chicken.
00:08
And so we've got two equations to write.
00:10
The first one is just the number of pounds of x beef plus the number of pounds of y chicken equals 18 pounds of meat.
00:18
So that's our first equation here.
00:20
And then our second one is the money.
00:22
So $6 times the beef, so 6x plus 450, 4 .5 times the chicken equals $96.
00:29
And i got rid of the decimal places there to make it a little easier.
00:33
So we've got two variables here.
00:34
We could use elimination or substitution.
00:36
I'm going to choose to use substitution.
00:38
So what i'm going to do is i'm going to solve for x on this equation.
00:42
X is the same as 18 minus y.
00:46
That's what x is.
00:48
So i'm going to take this value here, and i'm going to substitute it in to the second equation.
00:54
So i wrote the word substitution here.
00:55
So instead of 6x, i'm going to write 6 parentheses 18 minus y, and then finish the rest off...