document.write( "Question 698842: Find two equations with graphs that' intersect at (3,-1). Show that (3,-1) makes both equations true. \n" ); document.write( "
Algebra.Com's Answer #431069 by ankor@dixie-net.com(22740)\"\" \"About 
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Find two equations with graphs that' intersect at (3,-1). Show that (3,-1) makes both equations true.
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\n" ); document.write( "Write two equations with difference slopes, but x1 = 3, y1 = -1 are the same
\n" ); document.write( "Using the form: y - y1 = m(x - x1)
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\n" ); document.write( "y - (-1) = -3(x - 3)
\n" ); document.write( "y + 1 = -3x + 9
\n" ); document.write( "y = -3x + 9 - 1
\n" ); document.write( "y = -3x + 8; the 1st equation
\n" ); document.write( "and
\n" ); document.write( "y -(-1) = 2(x - 3)
\n" ); document.write( "y + 1 = 2x - 6
\n" ); document.write( "y = 2x - 6 - 1
\n" ); document.write( "y = 2x - 7; the 2nd equation
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\n" ); document.write( "Graph these
\n" ); document.write( "\"+graph%28+300%2C+300%2C+-3%2C+5%2C+-10%2C+10%2C+-3x%2B8%2C+2x-7%29+\"
\n" ); document.write( "You can see they intersect at 3, -1
\n" ); document.write( ":
\n" ); document.write( "YOu can prove this to yourself.
\n" ); document.write( "Replace x with 3 in both equations and see if y = -1\r
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