document.write( "Question 447165: Which is a point that lies on the graph of the equation: 2x-y=8?
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Algebra.Com's Answer #307886 by Edwin McCravy(20086) $\"\"$ $\"About$

You can put this solution on YOUR website!
A (3,-2)
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document.write( "We have to try them all out and see:\r\n" );
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document.write( "Let's try A (3,-2)\r\n" );
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document.write( "That means to substitute (3) for x and (-2) for y\r\n" );
document.write( "in this equation and simplify:\r\n" );
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document.write( "     2x - y = 8\r\n" );
document.write( "2(3) - (-2) = 8\r\n" );
document.write( "      6 + 2 = 8\r\n" );
document.write( "          8 = 8\r\n" );
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document.write( "That's true so A (3,-2) is the correct answer.\r\n" );
document.write( "But let's see why the others are not the answer:\r\n" );
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document.write( "-----\r\n" );
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document.write( "Let's try B (-2,6)\r\n" );
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document.write( "That means to substitute (-2) for x and (6) for y\r\n" );
document.write( "in this equation and simplify:\r\n" );
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document.write( "     2x - y = 8\r\n" );
document.write( "2(-2) - (6) = 8\r\n" );
document.write( "     -4 - 6 = 8\r\n" );
document.write( "        -10 = 8\r\n" );
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document.write( "That's false so B (-2,6) is not the correct answer.\r\n" );
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document.write( "-----\r\n" );
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document.write( "Let's try C (-3,-2)\r\n" );
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document.write( "That means to substitute (-3) for x and (-2) for y\r\n" );
document.write( "in this equation and simplify:\r\n" );
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document.write( "     2x - y = 8\r\n" );
document.write( "2(-3) - (-2) = 8\r\n" );
document.write( "     -6 + 2 = 8\r\n" );
document.write( "         -4 = 8\r\n" );
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document.write( "That's false so B (-3,-2) is not the correct answer.\r\n" );
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document.write( "-----\r\n" );
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document.write( "Let's try D (-2,-6)\r\n" );
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document.write( "That means to substitute (-2) for x and (-6) for y\r\n" );
document.write( "in this equation and simplify:\r\n" );
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document.write( "      2x - y = 8\r\n" );
document.write( "2(-2) - (-6) = 8\r\n" );
document.write( "      -4 + 6 = 8\r\n" );
document.write( "           2 = 8\r\n" );
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document.write( "That's false so D (-2,-6) is not the correct answer.\r\n" );
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document.write( "Edwuin

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