00:01
We're going to solve this system of equations.
00:03
So we have x plus y equals 5.
00:07
X plus y plus z equals 4.
00:14
2x minus y plus 2z equals negative 1.
00:21
Okay, so first off what we can do is i know x plus y equals 5, so i can replace this x plus y with 5.
00:34
So over here, i have 5 plus z equals 4, subtract 5 from both sides, and z will equal negative 1.
00:45
So we have one of our variables now.
00:48
We're going to go ahead and plug in z right here to this one.
00:52
So we have 2x minus y plus 2 times negative 1 equals negative 1, which this is negative 2.
01:02
So i'm going to add this 2 to both sides here, which leads me with 2x.
01:06
Minus y equals 1...