document.write( "Question 26372: How do you solve 6x-y=-4; x+2y=7 using substitution method? \n" ); document.write( "
Algebra.Com's Answer #14228 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! Solve the 1st equation for \"y\": y=6x+4 \n" ); document.write( "Substitute into the 2nd equation, as follows; \n" ); document.write( "X+2(6X+4)=7 \n" ); document.write( "X+12X+8=7 \n" ); document.write( "13X=-1 \n" ); document.write( "X=-1/13 \n" ); document.write( "Substitut that into y=6x+4 \n" ); document.write( "y=6(-1/13)+4 \n" ); document.write( "y=-6/13-52/13 \n" ); document.write( "y=46/13 \n" ); document.write( "Solution: x=-1/13; y=46/13 \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " |