[jmsoftball02]

I have to solve this linear equation with 3 variabes:

x-2y=1
x+3y+z=0
2x-2z=18

answer has to be in (x,y,z) formation... please help

[galactus]

Use elimination method or substitution method. Here is elimination:





Multiply the second row by 2:





Now, add it to the third row:




That eliminated z.

Now, Multiply the first row by -4:




Add to the second row:





Now, back substitute to find x and z.