document.write( "Question 711679: I was wondering how would you solve a linear system using subsitution? My teacher taught the class this in like 10 min and I'm not sure.. Can you show me to steps to answer -x+2y=-6 and 8x+y=31 thanks! \n" ); document.write( "
Algebra.Com's Answer #437561 by lynnlo(4176)![]() ![]() ![]() You can put this solution on YOUR website! -X+2Y=-6 \n" ); document.write( "8X+Y=3 \n" ); document.write( "STEP (1)MULTIPLY FIRST EQUATION BY 8 \n" ); document.write( "AFTER YOU MULTIPLY YOU WILL HAVE \n" ); document.write( "-8X+16Y=-48 \n" ); document.write( "8X+Y=3 \n" ); document.write( "STEP (2)ADD THE TWO EQUATIONS TOGETHER TO ELIMINATE X \n" ); document.write( "17Y=-45 \n" ); document.write( "STEP(3) FIND Y \n" ); document.write( "Y=-45/17 \n" ); document.write( "STEP (4)SUBSTITUTE THE VALUE FOR Y INTO THE ORIGINAL EQUATION TO SOLVE X \n" ); document.write( "-X+2(-45/17)=-6 \n" ); document.write( "X=12/17 \n" ); document.write( "Y=-45/17 \n" ); document.write( " |