document.write( "Question 229980: white an equation in slope intercept form of the line that contains the points S(7,-9) T(8,-7) \n" ); document.write( "

Algebra.Com's Answer #170866 by Alan3354(69443) $\"\"$ $\"About$

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white an equation in slope intercept form of the line that contains the points
\n" ); document.write( "S(7,-9) T(8,-7)
\n" ); document.write( "------------
\n" ); document.write( "Find the slope, m
\n" ); document.write( "m = diffy/diffx = 2/1
\n" ); document.write( "m = 2
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\n" ); document.write( "Then use either point in y=mx+b
\n" ); document.write( "-9 = 2*7+b
\n" ); document.write( "b = -23
\n" ); document.write( "--> y = 2x-23
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\n" ); document.write( "Using determinants:
\n" ); document.write( "|x +y 1|
\n" ); document.write( "|7 -9 1| = 0
\n" ); document.write( "|8 -7 1|
\n" ); document.write( "---------
\n" ); document.write( "x(-9+7) - y(7-8) + -49+72 = 0
\n" ); document.write( "-2x + y + 23 = 0
\n" ); document.write( "y = 2x-23
\n" ); document.write( " \n" ); document.write( "

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