document.write( "Question 351636: Use the given conditions to write an equation for each line. Leave each equation in slope intercept form if possible.\r
\n" ); document.write( "\n" ); document.write( "Passing through (-7,9) and (5,-9) \n" ); document.write( "

Algebra.Com's Answer #251261 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!
Hi,
\n" ); document.write( "*Note: first find the slope\r
\n" ); document.write( "\n" ); document.write( " $\"m=+%28y%5B2%5D+-+y%5B1%5D%29%2F%28x%5B2%5D+-+x%5B1%5D%29\"$
\n" ); document.write( ".
\n" ); document.write( "(-7,9) and (5,-9)
\n" ); document.write( " $\"m=+%28%28-9%29+-+9%29%2F%285+-+%28-7%29%29\"$
\n" ); document.write( ".
\n" ); document.write( " $\"m+=+%28-18%2F12%29+=+%28-3%2F2%29\"$ negative slope tell us line slopes to the left
\n" ); document.write( ".
\n" ); document.write( "y= mx + b is the slope intercept form of a line, where m is the slope and b the y-intercept
\n" ); document.write( ".
\n" ); document.write( "y = (-3/2)x + b
\n" ); document.write( ".
\n" ); document.write( "substituting one of the points (-7,9) to determine b
\n" ); document.write( "9 = (-3/2)*-7 +b
\n" ); document.write( "9 - (3/2)*7 = b
\n" ); document.write( "18/2 - 21/2 = -3/2 = b
\n" ); document.write( ".
\n" ); document.write( "y = (-3/2)x - 3/2\r
\n" ); document.write( "\n" ); document.write( "

\n" ); document.write( " \n" ); document.write( "

\n" );