document.write( "Question 1206892: Indicate in standard form the equation of the line passing through the given points, writing the answer in the equation box below. \r
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Algebra.Com's Answer #844594 by MathLover1(20850)\"\" \"About 
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Solved by pluggable solver: Finding the Equation of a Line
First lets find the slope through the points (\"-2\",\"2\") and (\"5\",\"1\")
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\n" ); document.write( " \"m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29\" Start with the slope formula (note: (\"x%5B1%5D\",\"y%5B1%5D\") is the first point (\"-2\",\"2\") and (\"x%5B2%5D\",\"y%5B2%5D\") is the second point (\"5\",\"1\"))
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\n" ); document.write( " \"m=%281-2%29%2F%285--2%29\" Plug in \"y%5B2%5D=1\",\"y%5B1%5D=2\",\"x%5B2%5D=5\",\"x%5B1%5D=-2\" (these are the coordinates of given points)
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\n" ); document.write( " \"m=+-1%2F7\" Subtract the terms in the numerator \"1-2\" to get \"-1\". Subtract the terms in the denominator \"5--2\" to get \"7\"
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\n" ); document.write( " So the slope is
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\n" ); document.write( " \"m=-1%2F7\"
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\n" ); document.write( "Now let's use the point-slope formula to find the equation of the line:
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\n" ); document.write( " ------Point-Slope Formula------
\n" ); document.write( " \"y-y%5B1%5D=m%28x-x%5B1%5D%29\" where \"m\" is the slope, and (\"x%5B1%5D\",\"y%5B1%5D\") is one of the given points
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\n" ); document.write( " So lets use the Point-Slope Formula to find the equation of the line
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\n" ); document.write( " \"y-2=%28-1%2F7%29%28x--2%29\" Plug in \"m=-1%2F7\", \"x%5B1%5D=-2\", and \"y%5B1%5D=2\" (these values are given)
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\n" ); document.write( " \"y-2=%28-1%2F7%29%28x%2B2%29\" Rewrite \"x--2\" as \"x%2B2\"
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\n" ); document.write( " \"y-2=%28-1%2F7%29x%2B%28-1%2F7%29%282%29\" Distribute \"-1%2F7\"
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\n" ); document.write( " \"y-2=%28-1%2F7%29x-2%2F7\" Multiply \"-1%2F7\" and \"2\" to get \"-2%2F7\"
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\n" ); document.write( " \"y=%28-1%2F7%29x-2%2F7%2B2\" Add \"2\" to both sides to isolate y
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\n" ); document.write( " \"y=%28-1%2F7%29x%2B12%2F7\" Combine like terms \"-2%2F7\" and \"2\" to get \"12%2F7\" (note: if you need help with combining fractions, check out this solver)
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\n" ); document.write( " Answer:
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\n" ); document.write( " So the equation of the line which goes through the points (\"-2\",\"2\") and (\"5\",\"1\") is:\"y=%28-1%2F7%29x%2B12%2F7\"
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\n" ); document.write( " The equation is now in \"y=mx%2Bb\" form (which is slope-intercept form) where the slope is \"m=-1%2F7\" and the y-intercept is \"b=12%2F7\"
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\n" ); document.write( " Notice if we graph the equation \"y=%28-1%2F7%29x%2B12%2F7\" and plot the points (\"-2\",\"2\") and (\"5\",\"1\"), we get this: (note: if you need help with graphing, check out this solver)
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\n" ); document.write( " Graph of \"y=%28-1%2F7%29x%2B12%2F7\" through the points (\"-2\",\"2\") and (\"5\",\"1\")
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\n" ); document.write( " Notice how the two points lie on the line. This graphically verifies our answer.
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\n" ); document.write( "\n" ); document.write( "\"y+=+-+%281%2F7%29x%2B12%2F7+\"....write in standard form \"Ax+%2B+By=+C\", both sides multiply by \"7\"\r
\n" ); document.write( "\n" ); document.write( "\"7y+=+-+x%2B12+\"\r
\n" ); document.write( "\n" ); document.write( "\"x%2B7y+=+12+\"
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