document.write( "Question 462176: find the coordinates of the point where the line 4y+6x+2=0 meets the line through PQ\r
\n" ); document.write( "\n" ); document.write( "P=(3,5)
\n" ); document.write( "Q=(-1,3) \r
\n" ); document.write( "\n" ); document.write( "the equation is Y=1/2x+3.5
\n" ); document.write( "PLEASE HELP!!
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Algebra.Com's Answer #317054 by rwm(914)\"\" \"About 
You can put this solution on YOUR website!
First find the equation of the line PQ
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Solved by pluggable solver: Finding the Equation of a Line
First lets find the slope through the points (\"-1\",\"3\") and (\"3\",\"5\")
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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 (\"-1\",\"3\") and (\"x%5B2%5D\",\"y%5B2%5D\") is the second point (\"3\",\"5\"))
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\n" ); document.write( " \"m=%285-3%29%2F%283--1%29\" Plug in \"y%5B2%5D=5\",\"y%5B1%5D=3\",\"x%5B2%5D=3\",\"x%5B1%5D=-1\" (these are the coordinates of given points)
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\n" ); document.write( " \"m=+2%2F4\" Subtract the terms in the numerator \"5-3\" to get \"2\". Subtract the terms in the denominator \"3--1\" to get \"4\"
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\n" ); document.write( " \"m=1%2F2\" Reduce
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\n" ); document.write( " So the slope is
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\n" ); document.write( " \"m=1%2F2\"
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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-3=%281%2F2%29%28x--1%29\" Plug in \"m=1%2F2\", \"x%5B1%5D=-1\", and \"y%5B1%5D=3\" (these values are given)
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\n" ); document.write( " \"y-3=%281%2F2%29%28x%2B1%29\" Rewrite \"x--1\" as \"x%2B1\"
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\n" ); document.write( " \"y-3=%281%2F2%29x%2B%281%2F2%29%281%29\" Distribute \"1%2F2\"
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\n" ); document.write( " \"y-3=%281%2F2%29x%2B1%2F2\" Multiply \"1%2F2\" and \"1\" to get \"1%2F2\"
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\n" ); document.write( " \"y=%281%2F2%29x%2B1%2F2%2B3\" Add \"3\" to both sides to isolate y
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\n" ); document.write( " \"y=%281%2F2%29x%2B7%2F2\" Combine like terms \"1%2F2\" and \"3\" to get \"7%2F2\" (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 (\"-1\",\"3\") and (\"3\",\"5\") is:\"y=%281%2F2%29x%2B7%2F2\"
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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%2F2\" and the y-intercept is \"b=7%2F2\"
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\n" ); document.write( " Notice if we graph the equation \"y=%281%2F2%29x%2B7%2F2\" and plot the points (\"-1\",\"3\") and (\"3\",\"5\"), we get this: (note: if you need help with graphing, check out this solver)
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\n" ); document.write( " Graph of \"y=%281%2F2%29x%2B7%2F2\" through the points (\"-1\",\"3\") and (\"3\",\"5\")
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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( "so using y=.5*x+3.5
\n" ); document.write( "or y=x/2+7/2
\n" ); document.write( "4y+6x=-2
\n" ); document.write( "substitute
\n" ); document.write( "4*(x/2+7/2)+6x+2=0
\n" ); document.write( "2x+14+6x+2=0
\n" ); document.write( "8x+16=0
\n" ); document.write( "8x=-16
\n" ); document.write( "x=-2
\n" ); document.write( "y=x/2+7/2
\n" ); document.write( "y=-2*1/2+7/2
\n" ); document.write( "y=-1+7/2
\n" ); document.write( "y=-2/2+7/2
\n" ); document.write( "y=5/2\r
\n" ); document.write( "\n" ); document.write( "(-2,5/2)\r
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