document.write( "Question 972676: doing equations with 3 unknowns having a hard time with this any help would be appreciated\r
\n" ); document.write( "\n" ); document.write( "3x+3y=3
\n" ); document.write( "-3x-2z=-11
\n" ); document.write( "y+z=-1 \n" ); document.write( "
Algebra.Com's Answer #594948 by lwsshak3(11628)\"\" \"About 
You can put this solution on YOUR website!
(eq1) 3x+3y=3
\n" ); document.write( "(eq2)-3x-2z=-11
\n" ); document.write( "(eq3)y+z=-1
\n" ); document.write( "***
\n" ); document.write( "3x+3y=3 (eq1)
\n" ); document.write( "-3x-2z=-11(eq2)
\n" ); document.write( "add:
\n" ); document.write( "3y-2z=-8 (eq4)
\n" ); document.write( "..
\n" ); document.write( "y+z=-1 (eq3)
\n" ); document.write( "2y+2z=-2 (mult. eq by 2)
\n" ); document.write( "3y-2z=-8 (eq4)
\n" ); document.write( "add:
\n" ); document.write( "5y=-10
\n" ); document.write( "y=-2
\n" ); document.write( "z=-1-y=-1+2=1
\n" ); document.write( "3x=3-3y=3-3(-2)=9
\n" ); document.write( "x=3
\n" ); document.write( "Check:\r
\n" ); document.write( "\n" ); document.write( "***
\n" ); document.write( "3x+3y=3 (eq1)
\n" ); document.write( "-3x-2z=-11(eq2)
\n" ); document.write( "add:
\n" ); document.write( "3y-2z=-8 (eq4)
\n" ); document.write( "..
\n" ); document.write( "y+z=-1 (eq3)
\n" ); document.write( "2y+2z=-2 (mult. eq by 2)
\n" ); document.write( "3y-2z=-8 (eq4)
\n" ); document.write( "add:
\n" ); document.write( "5y=-10
\n" ); document.write( "y=-2
\n" ); document.write( "z=-1-y=-1+2=1
\n" ); document.write( "3x=3-3y=3-3(-2)=9
\n" ); document.write( "x=3
\n" ); document.write( "y=-2
\n" ); document.write( "z=1
\n" ); document.write( "Check:
\n" ); document.write( " 3x+3y=3*3+3*-2=9-6=3
\n" ); document.write( "-3x-2z=-3*3-2*1=-9-2=-11
\n" ); document.write( "y+z=-2+1=-1
\n" ); document.write( "check ok: \n" ); document.write( "
\n" );