document.write( "Question 659977: complete the ordered pairs for the given equation:
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Algebra.Com's Answer #411018 by Edwin McCravy(20056)\"\" \"About 
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complete the ordered pairs for the given equation:
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document.write( "We are given the first coordinate 0 and we are asked to find the \r\n" );
document.write( "second coordinate.  The first coordinate is what we substitute\r\n" );
document.write( "for x, so we will substitute 0 for x in\r\n" );
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document.write( "  7x+3y = 21  and solve for the other letter y:\r\n" );
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document.write( "7(0)+3y = 21\r\n" );
document.write( "   0+3y = 21\r\n" );
document.write( "     3y = 21\r\n" );
document.write( "      y = 7\r\n" );
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document.write( "So the first one is (0,7)\r\n" );
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document.write( "We are given the second coordinate 0 and we are asked to find the \r\n" );
document.write( "first coordinate.  The second coordinate is what we substitute\r\n" );
document.write( "for y, so we will substitute 0 for y in\r\n" );
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document.write( "  7x+3y = 21  and solve for the other letter x:\r\n" );
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document.write( "7x+3(0) = 21\r\n" );
document.write( "   7y+0 = 21\r\n" );
document.write( "     7y = 21\r\n" );
document.write( "      y = 3\r\n" );
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document.write( "So the second one is (3,0)\r\n" );
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document.write( "We are given the first coordinate 6 and we are asked to find the \r\n" );
document.write( "second coordinate.  The first coordinate is what we substitute\r\n" );
document.write( "for x, so we will substitute 6 for x in\r\n" );
document.write( "\r\n" );
document.write( "  7x+3y = 21  and solve for the other letter y:\r\n" );
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document.write( "7(6)+3y = 21\r\n" );
document.write( "  42+3y = 21\r\n" );
document.write( "     3y = -21\r\n" );
document.write( "      y = -7\r\n" );
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document.write( "So the third one is (6,-7)\r\n" );
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document.write( "We are given the second coordinate 14 and we are asked to find the \r\n" );
document.write( "first coordinate.  The second coordinate is what we substitute\r\n" );
document.write( "for y, so we will substitute 14 for y in\r\n" );
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document.write( "   7x+3y = 21  and solve for the other letter x:\r\n" );
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document.write( "7x+3(14) = 21\r\n" );
document.write( "   7y+42 = 21\r\n" );
document.write( "      7y = -21\r\n" );
document.write( "       y = -3\r\n" );
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document.write( "So the last one is (-3,14)\r\n" );
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document.write( "Now we'll plot those ordered pairs as points:\r\n" );
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document.write( " (0,7), (3,0), (6,-7), (-3,14)  \r\n" );
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document.write( "and this is what we see on the left, and on the right \r\n" );
document.write( "we see that they all line up so that we can get a ruler \r\n" );
document.write( "and draw a straight line through all of those points\r\n" );
document.write( "represented by those ordered pairs.\r\n" );
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document.write( "        \r\n" );
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document.write( "Edwin
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