document.write( "Question 1132159: Solve the linear system and tell how many solutions the system has: x + y=3 x+2y=4 \n" ); document.write( "

Algebra.Com's Answer #749086 by MathLover1(20850) $\"\"$ $\"About$

You can put this solution on YOUR website!

\n" ); document.write( " $\"x+%2B+y=3+\"$ .........eq.1
\n" ); document.write( " $\"x%2B2y=4+\"$ .........eq.2
\n" ); document.write( "-----------------------------------substitute eq.1 from eq.2\r
\n" ); document.write( "\n" ); document.write( " $\"x%2B2y-%28x%2By%29=4-3+\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x%2B2y-x-y=1+\"$
\n" ); document.write( " $\"cross%28x%29%2B2y-cross%28x%29-y=1+\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"2y-y=1+\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=1+\"$ \r
\n" ); document.write( "\n" ); document.write( "go to $\"x+%2B+y=3+\"$ .........eq.1, substitute $\"y\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x+%2B+1=3+\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x+=3+-1\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x+=2\"$ \r
\n" ); document.write( "\n" ); document.write( "solution:\r
\n" ); document.write( "\n" ); document.write( "( $\"2\"$ , $\"1\"$ )\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+-x%2B3%2C+-x%2F2%2B2%29+\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );