00:01
To solve this problem, the first thing that i did was write the system of equations that they gave us, which was ax plus by minus 3z equals negative 3, negative 2x minus by plus cz equals negative 1, ax plus 3y minus cz is equal to negative 3.
00:38
Because they also told us what x, y, and z were, i plugged those in.
00:47
So x was 1, y was negative 1, and z was 2.
01:02
So from there i filled in 1, negative 1, and 2 in all three of the equations.
01:09
And for the first one, i was left with a minus b minus 6 equals negative 3.
01:17
I added 6 to both sides.
01:20
And i got a minus b was equal to 3.
01:24
I did the second one.
01:25
I got negative 2 plus b plus 2c equals negative 1.
01:30
I solved and i got b plus 2c equals positive 1.
01:37
And i did the last one.
01:42
A minus 3 minus 2c equals negative 3, and i ended up with a equals 2c...