document.write( "Question 132037: use the graphing method to solve the linear system and tell how many solutions the system has\r
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Algebra.Com's Answer #96441 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
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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-7y=10\"\r
\n" ); document.write( "\n" ); document.write( "\"-6x%2B4y=-22\"\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-7y=10\" Start with the given equation\r
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\n" ); document.write( "\n" ); document.write( "\"-7y=10-x\" Subtract \"+x\" from both sides\r
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\n" ); document.write( "\n" ); document.write( "\"-7y=-x%2B10\" Rearrange the equation\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-x%2B10%29%2F%28-7%29\" Divide both sides by \"-7\"\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28-1%2F-7%29x%2B%2810%29%2F%28-7%29\" Break up the fraction\r
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\n" ); document.write( "\n" ); document.write( "\"y=%281%2F7%29x-10%2F7\" Reduce\r
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\n" ); document.write( "\n" ); document.write( "Now lets graph \"y=%281%2F7%29x-10%2F7\" (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+%281%2F7%29x-10%2F7%29+\" Graph of \"y=%281%2F7%29x-10%2F7\"\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( "\"-6x%2B4y=-22\" Start with the given equation\r
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\n" ); document.write( "\n" ); document.write( "\"4y=-22%2B6x\" Add \"6+x\" to both sides\r
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\n" ); document.write( "\n" ); document.write( "\"4y=%2B6x-22\" Rearrange the equation\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28%2B6x-22%29%2F%284%29\" Divide both sides by \"4\"\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28%2B6%2F4%29x%2B%28-22%29%2F%284%29\" Break up the fraction\r
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\n" ); document.write( "\n" ); document.write( "\"y=%283%2F2%29x-11%2F2\" Reduce\r
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\n" ); document.write( "\n" ); document.write( "Now lets add the graph of \"y=%283%2F2%29x-11%2F2\" to our first plot to get:\r
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\n" ); document.write( "\n" ); document.write( " Graph of \"y=%281%2F7%29x-10%2F7\"(red) and \"y=%283%2F2%29x-11%2F2\"(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 (3,-1)
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