document.write( "Question 268057: how would I understand the the linear systems of by substutition. I am so confused bout that.The most confusing questions for me are for example:y=x-4 3x+2y=7 \n" ); document.write( "

Algebra.Com's Answer #196548 by jim_thompson5910(35256) $\"\"$ $\"About$

You can put this solution on YOUR website!
Here's the basic idea:\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Step 1) Pick an equation and a variable to solve for. In this case, we're given $\"y=x-4\"$ which is already solved for 'y' (ie 'y' is isolated on one side). So we don't have to do this step.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Step 2) Move onto the other equation and plug in $\"y=x-4\"$ . In other words, replace each 'y' term with 'x-4'. Doing this gets you $\"3x%2B2%28x-4%29=7\"$ . From here, we have a simple linear equation.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Step 3) Since you have a simple linear equation with one variable, you can easily solve for that variable (if a solution exists). \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Step 4) Once you have a solution in terms of 'x', plug that value into $\"y=x-4\"$ to find the solution in terms of 'y'.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );