document.write( "Question 956088: . Which set of points lies on the given graph?\r
\n" ); document.write( "\n" ); document.write( "VHS_ALG_S1_07_L203_L303_LQ1-graphic.gif \r
\n" ); document.write( "\n" ); document.write( "(Points : 1)
\n" ); document.write( " (4, 11), (–2, 7), (1, –1)
\n" ); document.write( " (4, 11), (2, –7), (1, 1)
\n" ); document.write( " (–4, 11), (–2, 7), (1, –1)
\n" ); document.write( " (–4, 11), (–2, 7), (1, 1)
\n" ); document.write( "

Algebra.Com's Answer #584142 by MathLover1(20850)\"\" \"About 
You can put this solution on YOUR website!
check which ones lie in a line:\r
\n" ); document.write( "\n" ); document.write( "(4, 11), (–2, 7), (1, –1)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "\n" ); document.write( "
Solved by pluggable solver: To determine if 3 points lie in a line
The 3 points lie on a same plane. For all points to lie on a line they should satisfy the equation of a line. Hence any two points taken on a line should calculate to the same slope of a line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " In order to prove the 3 points to lie on a line, as there exists a unique line containing three points and every line has a unique slope.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Hence it will be sufficient to prove that the slope calculated taking 2 points at a time should be equal.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Slope of line taking points (X1,Y1) and (X2,Y2) is
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28Y2-Y1%29%2F%28X2-X1%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28%287-11%29%2F%28-2-4%29%29+=+0.666666666666667\" ........................(1)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Slope of line taking points (X3,Y3) and (X1,Y1) is
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28Y3-Y1%29%2F%28X3-X1%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28%28-1-11%29%2F%281-4%29%29+=+4\" ........................(2)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " From conditions (1) and (2)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " The 3 points do not a same line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " For all points to lie on a line they should satisfy the equation of a line. Hence any two points taken on a line should calculate to the same slope of a line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Here the slopes are unequal hence the points do not lie on same line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " To read more on equations of a line refer to articles on wikipedia
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \r
\n" ); document.write( "\n" ); document.write( "NOT an answer\r
\n" ); document.write( "\n" ); document.write( "(4, 11), (2, –7), (1, 1)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "\n" ); document.write( "
Solved by pluggable solver: To determine if 3 points lie in a line
The 3 points lie on a same plane. For all points to lie on a line they should satisfy the equation of a line. Hence any two points taken on a line should calculate to the same slope of a line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " In order to prove the 3 points to lie on a line, as there exists a unique line containing three points and every line has a unique slope.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Hence it will be sufficient to prove that the slope calculated taking 2 points at a time should be equal.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Slope of line taking points (X1,Y1) and (X2,Y2) is
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28Y2-Y1%29%2F%28X2-X1%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28%28-7-11%29%2F%282-4%29%29+=+9\" ........................(1)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Slope of line taking points (X3,Y3) and (X1,Y1) is
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28Y3-Y1%29%2F%28X3-X1%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28%281-11%29%2F%281-4%29%29+=+3.33333333333333\" ........................(2)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " From conditions (1) and (2)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " The 3 points do not a same line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " For all points to lie on a line they should satisfy the equation of a line. Hence any two points taken on a line should calculate to the same slope of a line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Here the slopes are unequal hence the points do not lie on same line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " To read more on equations of a line refer to articles on wikipedia
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "(–4, 11), (–2, 7), (1, –1)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "\n" ); document.write( "
Solved by pluggable solver: To determine if 3 points lie in a line
The 3 points lie on a same plane. For all points to lie on a line they should satisfy the equation of a line. Hence any two points taken on a line should calculate to the same slope of a line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " In order to prove the 3 points to lie on a line, as there exists a unique line containing three points and every line has a unique slope.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Hence it will be sufficient to prove that the slope calculated taking 2 points at a time should be equal.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Slope of line taking points (X1,Y1) and (X2,Y2) is
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28Y2-Y1%29%2F%28X2-X1%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28%287-11%29%2F%28-2--4%29%29+=+-2\" ........................(1)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Slope of line taking points (X3,Y3) and (X1,Y1) is
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28Y3-Y1%29%2F%28X3-X1%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28%28-1-11%29%2F%281--4%29%29+=+-2.4\" ........................(2)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " From conditions (1) and (2)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " The 3 points do not a same line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " For all points to lie on a line they should satisfy the equation of a line. Hence any two points taken on a line should calculate to the same slope of a line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Here the slopes are unequal hence the points do not lie on same line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " To read more on equations of a line refer to articles on wikipedia
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "(\"-4\", \"11\"), (\"-2\", \"7\"), (\"1\", \"1\") \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "\n" ); document.write( "
Solved by pluggable solver: To determine if 3 points lie in a line
The 3 points lie on a same plane. For all points to lie on a line they should satisfy the equation of a line. Hence any two points taken on a line should calculate to the same slope of a line.
\n" ); document.write( "
\n" ); document.write( " In order to prove the 3 points to lie on a line, as there exists a unique line containing three points and every line has a unique slope.
\n" ); document.write( " Hence it will be sufficient to prove that the slope calculated taking 2 points at a time should be equal.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Slope of line taking points (X1,Y1) and (X2,Y2) is
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28Y2-Y1%29%2F%28X2-X1%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28%287-11%29%2F%28-2--4%29%29+=+-2\" ........................(1)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " Slope of line taking points (X3,Y3) and (X1,Y1) is
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28Y3-Y1%29%2F%28X3-X1%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28%281-11%29%2F%281--4%29%29+=+-2\" ........................(2)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " From conditions (1) and (2)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " The slopes are equal hence the 3 points can lie on same line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " If the slope calculated from points (X2,Y2) and (X3,Y3) comes out to be same then it is confirmed that the 3 points lie on a same line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28Y3-Y2%29%2F%28X3-X2%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " \"slope+=+%28%281-7%29%2F%281--2%29%29+=+-2\" ........................(3)
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " From (1),(2) and (3)
\n" ); document.write( "
\n" ); document.write( " Hence, It is proved that the 3 points lie on same line.
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( " To read more on equations of a line refer to articles on wikipedia
\n" ); document.write( "

\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "your answer is:(\"-4\", \"11\"), (\"-2\", \"7\"), (\"1\", \"1\")\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );