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 \n" );
document.write( "
Algebra.Com's Answer #638877 by fractalier(6550)![]() ![]() 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. \n" ); document.write( " |