document.write( "Question 591879: Solve using substitution
\n" ); document.write( "y=3x+8
\n" ); document.write( "3y-x=7\r
\n" ); document.write( "\n" ); document.write( "I found the value of x, but I get stuck when trying to find y
\n" ); document.write( "y=3(-17/8)+8\r
\n" ); document.write( "\n" ); document.write( "Please help I know the answer x=13/8 but I want to know how to get the answer!!!
\n" ); document.write( "Thank you \n" ); document.write( "
Algebra.Com's Answer #375784 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
Solve using substitution
\n" ); document.write( "y = 3x + 8
\n" ); document.write( "3y - x = 7
\n" ); document.write( "substitute (3x+8) for y
\n" ); document.write( "3(3x+8) - x = 7
\n" ); document.write( "9x + 24 - x = 7
\n" ); document.write( "9x - x = 7 - 24
\n" ); document.write( "8x = -17
\n" ); document.write( "x = -17/8, which you got
\n" ); document.write( ":
\n" ); document.write( "The using the 1st equation, replace x
\n" ); document.write( "y = 3(-17/8) + 8
\n" ); document.write( "y = -51/8 + 8
\n" ); document.write( "Change 8 to 64/8
\n" ); document.write( "y = -51/8 + 64/8
\n" ); document.write( "y = 13/8
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check solutions in the 2nd equation
\n" ); document.write( "3y - x = 7
\n" ); document.write( "3(13/8) - (-17/8) = 7
\n" ); document.write( "39/8 + 17/8 =
\n" ); document.write( "56/8 = 7 \n" ); document.write( "
\n" );