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\n" ); document.write( "Through (-3,4);horizontal is it 3x+4y=0?
\n" ); document.write( "Since it's horizontal (parallel to the x-axis), y does not change.
\n" ); document.write( "That makes it y = 4.
\n" ); document.write( "-----------------------
\n" ); document.write( "\" \" (-2,8) m = -1 is it 2x + y= -8?
\n" ); document.write( "For these, always use
\n" ); document.write( "y-y1 = m*(x-x1) where (x1,y1) is the given point.
\n" ); document.write( "y-8 = -1*(x+2)
\n" ); document.write( "y-8 = -x-2
\n" ); document.write( "x+y = 6
\n" ); document.write( "-------------
\n" ); document.write( "\" \" (-4,7); parallell to 3x+4y = 4
\n" ); document.write( "In this one, you have to find the slope of 3x+4y=4. Put it in slope-intercept form (that means solve for y).
\n" ); document.write( "3x+4y = 4
\n" ); document.write( "4y = -3x+4
\n" ); document.write( "y = (-3/4)x + 1
\n" ); document.write( "m = -3/4
\n" ); document.write( "----------
\n" ); document.write( "Then it's the same as the one above.
\n" ); document.write( "y-y1 = m*(x-x1)
\n" ); document.write( "------------------
\n" ); document.write( "\" \" (-4,7); perpendicular to x-2y = 0
\n" ); document.write( "Find the slope of x-2y=0
\n" ); document.write( "y = (1/2)x --> m = 1/2
\n" ); document.write( "The slope of lines perpendicular will be the negative inverse.
\n" ); document.write( "m = -2
\n" ); document.write( "----------
\n" ); document.write( "Then it's the same as above.
\n" ); document.write( "-----------------
\n" ); document.write( "\" \" (2,-7) and (3,-1) is it x-6y=44?
\n" ); document.write( "Find the slope.
\n" ); document.write( "m = diffy/diffx = (-1+7)/(3-2)
\n" ); document.write( "m = 6
\n" ); document.write( "Then, use either point and same as above.
\n" ); document.write( "y+1 = 6*(x-3)
\n" ); document.write( "y+1 = 6x-18
\n" ); document.write( "6x-y = 17
\n" ); document.write( " \n" ); document.write( "