document.write( "Question 621782: 1. write the equation to the line with these points (3,-4),(3,-2)?
\n" ); document.write( "2. how to find the equation to the points of (1,4),(2,2)? \n" ); document.write( "

Algebra.Com's Answer #390987 by Alan3354(69443) $\"\"$ $\"About$

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1. write the equation to the line with these points (3,-4),(3,-2)?
\n" ); document.write( "x is the same --> x = 3
\n" ); document.write( "-------------------------------
\n" ); document.write( "2. how to find the equation to the points of (1,4),(2,2)?\r
\n" ); document.write( "\n" ); document.write( "Do it like this:
\n" ); document.write( "i need to find the equation of the line that passes through each pair of points and write the answer in standard form
\n" ); document.write( "(-2,-4), (1,-1)
\n" ); document.write( "--------------
\n" ); document.write( "Find the slope, m
\n" ); document.write( "m = diffy/diffx = (-4 + 1)/(-2 -1) = -3/-3 = 1
\n" ); document.write( "-----
\n" ); document.write( "Use y = mx + b and either point to find b
\n" ); document.write( "-1 = 1*1 + b
\n" ); document.write( "b = -2
\n" ); document.write( "-----
\n" ); document.write( "y = x - 2
\n" ); document.write( "x - y = 2
\n" ); document.write( "==================
\n" ); document.write( "Using determinants:
\n" ); document.write( "|+x +y 1|
\n" ); document.write( "|-2 -4 1| = 0
\n" ); document.write( "|+1 -1 1|
\n" ); document.write( "-------
\n" ); document.write( "x*(-4+1) - y*(-2-1) + 1*(2+4) = 0
\n" ); document.write( "-3x + 3y = -6
\n" ); document.write( "x - y = 2 \n" ); document.write( "

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