document.write( "Question 487086: I need help to plot the graph 2y+x=0
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #332959 by Theo(13342) $\"\"$ $\"About$

You can put this solution on YOUR website!
you need to solve for y in order to graph the equation.
\n" ); document.write( "2y + x = 0
\n" ); document.write( "subtract x from both sides of the equation to get:
\n" ); document.write( "2y = -x
\n" ); document.write( "divide both sides of the equation by 2 to get:
\n" ); document.write( "y = -x/2
\n" ); document.write( "that's the equation you want to graph.
\n" ); document.write( "since it's a straight line, all you have to do is plot 2 points and then draw a straight line through them.
\n" ); document.write( "if you pick x = -2, and x = 2, your table of values would like this:
\n" ); document.write( "

\r\n" );
document.write( "       x       y = -x/2\r\n" );
document.write( "      -2       1\r\n" );
document.write( "       2      -2\r\n" );
document.write( "

\n" ); document.write( "when x = -2, y = 1
\n" ); document.write( "when x = 2, y = -1
\n" ); document.write( "draw your straight line between those 2 points and extend it to the limits of the graph and you have your graph of that equation.
\n" ); document.write( "you graph should look like this:
\n" ); document.write( " $\"graph%28400%2C400%2C-5%2C5%2C-5%2C5%2C-x%2F2%29\"$
\n" ); document.write( "from this graph, you can see that when x = 2, y = -1, and when x = -2, y = 1. \n" ); document.write( "

\n" );