document.write( "Question 363034: Are the points (-1,8), (1,2), and (4,-7) on the same line? Explain your reasoning \n" ); document.write( "
Algebra.Com's Answer #258760 by mananth(16949) You can put this solution on YOUR website! Are the points (-1,8), (1,2), and (4,-7) on the same line? Explain your reasoning \n" ); document.write( "...\r \n" ); document.write( "\n" ); document.write( "find the slope of the line passing through (-1,8) (1,2) \n" ); document.write( "m=2-8/1-(-1) \n" ); document.write( "=-6/2 \n" ); document.write( "=-3 \n" ); document.write( "... \n" ); document.write( "form an equation using (-1,8). If the other two points satisfy the equation then all points are collinear. \n" ); document.write( "y-8=-3(x-(-1) \n" ); document.write( "y-8=-3x-3 \n" ); document.write( "y=-3x-3+8 \n" ); document.write( "y=-3x+5 \n" ); document.write( ".. \n" ); document.write( "point 1,2 \n" ); document.write( "2=-3(1)+5 \n" ); document.write( "2=-3+5 \n" ); document.write( "2=2 ( TRUE) \n" ); document.write( "point (4,-7) \n" ); document.write( "-7=-3*4+5 \n" ); document.write( "-7=-12+5 \n" ); document.write( "-7=-7 (TRUE) \n" ); document.write( "so the lines are collinear \n" ); document.write( "... \n" ); document.write( "m.ananth@hotmail.ca \n" ); document.write( " |