Algebra.Com's Answer #584142 by MathLover1(20850)  You can put this solution on YOUR website! check which ones lie in a line:\r \n" );
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document.write( "(4, 11), (–2, 7), (1, –1)\r \n" );
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document.write( " | Solved by pluggable solver: To determine if 3 points lie in a line | \n" );
document.write( " 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" );
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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" );
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document.write( " Hence it will be sufficient to prove that the slope calculated taking 2 points at a time should be equal. \n" );
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document.write( " Slope of line taking points (X1,Y1) and (X2,Y2) is \n" );
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document.write( " ........................(1) \n" );
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document.write( " Slope of line taking points (X3,Y3) and (X1,Y1) is \n" );
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document.write( " ........................(2) \n" );
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document.write( " From conditions (1) and (2) \n" );
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document.write( " The 3 points do not a same line. \n" );
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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" );
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document.write( " Here the slopes are unequal hence the points do not lie on same line. \n" );
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document.write( " To read more on equations of a line refer to articles on wikipedia \n" );
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document.write( "NOT an answer\r \n" );
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document.write( "(4, 11), (2, –7), (1, 1)\r \n" );
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document.write( " | Solved by pluggable solver: To determine if 3 points lie in a line | \n" );
document.write( " 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" );
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document.write( " ........................(1) \n" );
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document.write( " Slope of line taking points (X3,Y3) and (X1,Y1) is \n" );
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document.write( " ........................(2) \n" );
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document.write( " From conditions (1) and (2) \n" );
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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" );
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document.write( " \r \n" );
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document.write( "(–4, 11), (–2, 7), (1, –1)\r \n" );
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document.write( "\n" );
document.write( " | Solved by pluggable solver: To determine if 3 points lie in a line | \n" );
document.write( " 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" );
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document.write( "  \n" );
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document.write( " ........................(1) \n" );
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document.write( " Slope of line taking points (X3,Y3) and (X1,Y1) is \n" );
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document.write( "  \n" );
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document.write( " ........................(2) \n" );
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document.write( " From conditions (1) and (2) \n" );
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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" );
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document.write( "( , ), ( , ), ( , ) \r \n" );
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document.write( "\n" );
document.write( " | Solved by pluggable solver: To determine if 3 points lie in a line | \n" );
document.write( " 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" );
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document.write( "  \n" );
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document.write( " ........................(1) \n" );
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document.write( " Slope of line taking points (X3,Y3) and (X1,Y1) is \n" );
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document.write( "  \n" );
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document.write( " ........................(2) \n" );
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document.write( " From conditions (1) and (2) \n" );
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document.write( " The slopes are equal hence the 3 points can lie on same line. \n" );
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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" );
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document.write( " ........................(3) \n" );
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document.write( " From (1),(2) and (3) \n" );
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document.write( " Hence, It is proved that the 3 points lie on same line. \n" );
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document.write( " To read more on equations of a line refer to articles on wikipedia \n" );
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document.write( "your answer is:( , ), ( , ), ( , )\r \n" );
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