document.write( "Question 1023386: A student is solving the system of equations below. In which line is a mistake first made?\r
\n" ); document.write( "\n" ); document.write( "2x + y -­ 2z = 23
\n" ); document.write( "3x + 2y + z = 11
\n" ); document.write( "x -­ y + z = ­-2\r
\n" ); document.write( "\n" ); document.write( "Line 1 z = 11 + 3x + 2y
\n" ); document.write( "Line 2 2x + y ­- 2(11 + 3x + 2y) = 23
\n" ); document.write( "Line 3 ­-4x ­- 3y = 45
\n" ); document.write( "Line 4 x -­ y + (11 + 3x + 2y) = ­- 2
\n" ); document.write( "Line 5 4x + y = - ­13
\n" ); document.write( "Line 6 ­-2y = 32
\n" ); document.write( "Line 7 y = ­16, x = ¾, z = ­-11/4
\n" ); document.write( "--------------\r
\n" ); document.write( "\n" ); document.write( "A) Line 1
\n" ); document.write( "B) Line 3
\n" ); document.write( "C) Line 5
\n" ); document.write( "D) Line 6
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Algebra.Com's Answer #638877 by fractalier(6550)\"\" \"About 
You can put this solution on YOUR website!
I'm thinking the first mistake is in line 1. If you solve the second equation for z, you should get
\n" ); document.write( "z = 11 - 3x - 2y
\n" ); document.write( "Choice A.
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