document.write( "Question 124889: Could you please help me with the steps,in this kind of problem? I know that I have to solve each system graphically,but I have been sick and don't remember how to work them.Thank you in advance.LH
\n" ); document.write( "1) x-y=3
\n" ); document.write( " x+y=5
\n" ); document.write( "2)3x+y=5
\n" ); document.write( " x-2y=4
\n" ); document.write( "3)4y=x+8
\n" ); document.write( " 3x-2y=6
\n" ); document.write( "4)x=y-1
\n" ); document.write( " 2x=3y
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Algebra.Com's Answer #91523 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
I'll do the first two to get you started\r
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\n" ); document.write( "\n" ); document.write( "Start with the given system of equations:\r
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\n" ); document.write( "\n" ); document.write( "\"1x-y=3\"\r
\n" ); document.write( "\n" ); document.write( "\"1x%2By=5\"\r
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\n" ); document.write( "\n" ); document.write( "In order to graph these equations, we need to solve for y for each equation.\r
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\n" ); document.write( "\n" ); document.write( "So let's solve for y on the first equation\r
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\n" ); document.write( "\n" ); document.write( "\"1x-y=3\" Start with the given equation\r
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\n" ); document.write( "\n" ); document.write( "\"-y=3-x\" Subtract \"+x\" from both sides\r
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\n" ); document.write( "\n" ); document.write( "\"-y=-x%2B3\" Rearrange the equation\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-x%2B3%29%2F%28-1%29\" Divide both sides by \"-1\"\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-1%2F-1%29x%2B%283%29%2F%28-1%29\" Break up the fraction\r
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\n" ); document.write( "\n" ); document.write( "\"y=x-3\" Reduce\r
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\n" ); document.write( "\n" ); document.write( "Now lets graph \"y=x-3\" (note: if you need help with graphing, check out this solver)\r
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\n" ); document.write( "\n" ); document.write( "\"+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+x-3%29+\" Graph of \"y=x-3\"\r
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\n" ); document.write( "\n" ); document.write( "So let's solve for y on the second equation\r
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\n" ); document.write( "\n" ); document.write( "\"1x%2By=5\" Start with the given equation\r
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\n" ); document.write( "\n" ); document.write( "\"1y=5-x\" Subtract \"+x\" from both sides\r
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\n" ); document.write( "\n" ); document.write( "\"1y=-x%2B5\" Rearrange the equation\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-x%2B5%29%2F%281%29\" Divide both sides by \"1\"\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-1%2F1%29x%2B%285%29%2F%281%29\" Break up the fraction\r
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\n" ); document.write( "\n" ); document.write( "\"y=-x%2B5\" Reduce\r
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\n" ); document.write( "\n" ); document.write( "Now lets add the graph of \"y=-x%2B5\" to our first plot to get:\r
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\n" ); document.write( "\n" ); document.write( "\"+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+x-3%2C-x%2B5%29+\" Graph of \"y=x-3\"(red) and \"y=-x%2B5\"(green)\r
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\n" ); document.write( "\n" ); document.write( "From the graph, we can see that the two lines intersect at the point (\"4\",\"1\") (note: you might have to adjust the window to see the intersection)\r
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\r
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\n" ); document.write( "\n" ); document.write( "# 2\r
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\n" ); document.write( "\n" ); document.write( "Start with the given system of equations:\r
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\n" ); document.write( "\n" ); document.write( "\"3x%2By=5\"\r
\n" ); document.write( "\n" ); document.write( "\"1x-2y=4\"\r
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\n" ); document.write( "\n" ); document.write( "In order to graph these equations, we need to solve for y for each equation.\r
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\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So let's solve for y on the first equation\r
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\n" ); document.write( "\n" ); document.write( "\"3x%2By=5\" Start with the given equation\r
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\n" ); document.write( "\n" ); document.write( "\"1y=5-3x\" Subtract \"3+x\" from both sides\r
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\n" ); document.write( "\n" ); document.write( "\"1y=-3x%2B5\" Rearrange the equation\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-3x%2B5%29%2F%281%29\" Divide both sides by \"1\"\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-3%2F1%29x%2B%285%29%2F%281%29\" Break up the fraction\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y=-3x%2B5\" Reduce\r
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\n" ); document.write( "\n" ); document.write( "Now lets graph \"y=-3x%2B5\" (note: if you need help with graphing, check out this solver)\r
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\n" ); document.write( "\n" ); document.write( "\"+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+-3x%2B5%29+\" Graph of \"y=-3x%2B5\"\r
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\n" ); document.write( "\n" ); document.write( "So let's solve for y on the second equation\r
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\n" ); document.write( "\n" ); document.write( "\"1x-2y=4\" Start with the given equation\r
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\n" ); document.write( "\n" ); document.write( "\"-2y=4-x\" Subtract \"+x\" from both sides\r
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\n" ); document.write( "\n" ); document.write( "\"-2y=-x%2B4\" Rearrange the equation\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-x%2B4%29%2F%28-2%29\" Divide both sides by \"-2\"\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-1%2F-2%29x%2B%284%29%2F%28-2%29\" Break up the fraction\r
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\n" ); document.write( "\n" ); document.write( "\"y=%281%2F2%29x-2\" Reduce\r
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\n" ); document.write( "\n" ); document.write( "Now lets add the graph of \"y=%281%2F2%29x-2\" to our first plot to get:\r
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\n" ); document.write( "\n" ); document.write( "\"+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+-3x%2B5%2C%281%2F2%29x-2%29+\" Graph of \"y=-3x%2B5\"(red) and \"y=%281%2F2%29x-2\"(green)\r
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\n" ); document.write( "\n" ); document.write( "From the graph, we can see that the two lines intersect at the point (\"2\",\"-1\") (note: you might have to adjust the window to see the intersection)
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