document.write( "Question 170331This question is from textbook Introductory Algebra
\n" ); document.write( ": Solve using the substitution method\r
\n" ); document.write( "\n" ); document.write( "y = 2x - 5
\n" ); document.write( "3x + y = 15 \n" ); document.write( "
Algebra.Com's Answer #125884 by elima(1433)\"\" \"About 
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Since you are already given what y equals, we will plug that into the second equation to find x;
\n" ); document.write( "y = 2x - 5
\n" ); document.write( "3x + y = 15
\n" ); document.write( "===================
\n" ); document.write( "3x + (2x - 5) = 15
\n" ); document.write( "5x - 5 = 15
\n" ); document.write( "5x = 20
\n" ); document.write( "x = 4
\n" ); document.write( "Now we have x, lets plug that into the equation to find y;
\n" ); document.write( "3(4) + y =15
\n" ); document.write( "12 + y =15
\n" ); document.write( "y = 15-12
\n" ); document.write( "y = 3
\n" ); document.write( ":) \n" ); document.write( "
\n" );