document.write( "Question 16708: 1.) 3x+y=15
\n" ); document.write( " y=3\r
\n" ); document.write( "\n" ); document.write( "2.)3x-2y=12
\n" ); document.write( " -y+9=x \n" ); document.write( "
Algebra.Com's Answer #8145 by elima(1433)\"\" \"About 
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1.) 3x+y=15
\n" ); document.write( " y=3
\n" ); document.write( "This equation you are just going to plug in the y=3 into the equation;
\n" ); document.write( "3x+3=15
\n" ); document.write( "subtract 3 from both sides;
\n" ); document.write( "3x+3-3=15-3
\n" ); document.write( "3x=12
\n" ); document.write( "Divide each side by 3;
\n" ); document.write( "\"3x%2F3\"=\"12%2F3\"
\n" ); document.write( "x=4
\n" ); document.write( "2.)3x-2y=12
\n" ); document.write( " -y+9=x
\n" ); document.write( "This equation your are first going to solve the second equation for y;
\n" ); document.write( "-y+9=x
\n" ); document.write( "y=-x+9\r
\n" ); document.write( "\n" ); document.write( "Now plug that into the other equation for y;
\n" ); document.write( "3x-2(-x+9)=12
\n" ); document.write( "3x+2x-18=12
\n" ); document.write( "Add like terms and add 18 to both sides;
\n" ); document.write( "5x=12+18
\n" ); document.write( "5x=30
\n" ); document.write( "Divide each side by 5;
\n" ); document.write( "\"5x%2F5\"=\"30%2F5\"
\n" ); document.write( "x=6
\n" ); document.write( "Now we know what x= so plug it into equation to find y;
\n" ); document.write( "3(6)-2y=12
\n" ); document.write( "18-2y=12
\n" ); document.write( "-2y=-6
\n" ); document.write( "y=3
\n" ); document.write( "Don't forget to check your answer;
\n" ); document.write( "Hope I didn't lose you, I know there is a lot of steps
\n" ); document.write( "=) \n" ); document.write( "
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