document.write( "Question 717676: find the solution to each system by the substitution method 3x-5y=7 x-4y= -7 \n" ); document.write( "
Algebra.Com's Answer #440413 by checkley79(3341)![]() ![]() ![]() You can put this solution on YOUR website! 3x-5y=7 \n" ); document.write( "x-4y= -7 \n" ); document.write( "x=4y-7 replace x with (4y-7) in the first equation & solve for y. \n" ); document.write( "3(4y-7)-5y=7 \n" ); document.write( "12y-21-5y=7 \n" ); document.write( "7y=7+21 \n" ); document.write( "7y=28 \n" ); document.write( "y=28/7 \n" ); document.write( "y=4 ans. \n" ); document.write( "x=4*4-7 \n" ); document.write( "x=16-7 \n" ); document.write( "x=9 ans. \n" ); document.write( "Proof: \n" ); document.write( "3*9-5*4=7 \n" ); document.write( "27-20=7 \n" ); document.write( "7=7 \n" ); document.write( " \n" ); document.write( " |