document.write( "Question 1003269: I really need some help with this problem:\r
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\n" ); document.write( "\n" ); document.write( "write the slope/intercept form of the equations of the lines described.\r
\n" ); document.write( "\n" ); document.write( "1. through: (-2,1) parallel to y=1/2x + 5 \r
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Algebra.Com's Answer #620024 by MathLover1(20850)\"\" \"About 
You can put this solution on YOUR website!
1. through: (\"-2\",\"1\") parallel to \"y=%281%2F2%29x+%2B+5\" \r
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Solved by pluggable solver: Finding the Equation of a Line Parallel or Perpendicular to a Given Line

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\n" ); document.write( " Since any two parallel lines have the same slope we know the slope of the unknown line is \"1%2F2\" (its from the slope of \"y=%281%2F2%29%2Ax%2B5\" which is also \"1%2F2\").\n" ); document.write( "Also since the unknown line goes through (-2,1), we can find the equation by plugging in this info into the point-slope formula
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\n" ); document.write( " Point-Slope Formula:
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\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 the given point
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\n" ); document.write( " \"y-1=%281%2F2%29%2A%28x%2B2%29\" Plug in \"m=1%2F2\", \"x%5B1%5D=-2\", and \"y%5B1%5D=1\"
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\n" ); document.write( " \"y-1=%281%2F2%29%2Ax-%281%2F2%29%28-2%29\" Distribute \"1%2F2\"
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\n" ); document.write( " \"y-1=%281%2F2%29%2Ax%2B2%2F2\" Multiply
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\n" ); document.write( " \"y=%281%2F2%29%2Ax%2B2%2F2%2B1\"Add \"1\" to both sides to isolate y
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\n" ); document.write( " \"y=%281%2F2%29%2Ax%2B2%2F2%2B2%2F2\" Make into equivalent fractions with equal denominators
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\n" ); document.write( " \"y=%281%2F2%29%2Ax%2B4%2F2\" Combine the fractions
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\n" ); document.write( " \"y=%281%2F2%29%2Ax%2B2\" Reduce any fractions
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\n" ); document.write( " So the equation of the line that is parallel to \"y=%281%2F2%29%2Ax%2B5\" and goes through (\"-2\",\"1\") is \"y=%281%2F2%29%2Ax%2B2\"
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\n" ); document.write( " So here are the graphs of the equations \"y=%281%2F2%29%2Ax%2B5\" and \"y=%281%2F2%29%2Ax%2B2\"
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\n" ); document.write( " graph of the given equation \"y=%281%2F2%29%2Ax%2B5\" (red) and graph of the line \"y=%281%2F2%29%2Ax%2B2\"(green) that is parallel to the given graph and goes through (\"-2\",\"1\")
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\n" ); document.write( "\n" ); document.write( "2. through: (\"3\", \"-5\") perpendicular to \"y=+%284%2F3%29x+%2B+3\"\r
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Solved by pluggable solver: Finding the Equation of a Line Parallel or Perpendicular to a Given Line

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\n" ); document.write( " Remember, any two perpendicular lines are negative reciprocals of each other. So if you're given the slope of \"4%2F3\", you can find the perpendicular slope by this formula:
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\n" ); document.write( " \"m%5Bp%5D=-1%2Fm\" where \"m%5Bp%5D\" is the perpendicular slope
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\n" ); document.write( " \"m%5Bp%5D=-1%2F%284%2F3%29\" So plug in the given slope to find the perpendicular slope
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\n" ); document.write( " \"m%5Bp%5D=%28-1%2F1%29%283%2F4%29\" When you divide fractions, you multiply the first fraction (which is really \"1%2F1\") by the reciprocal of the second
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\n" ); document.write( " \"m%5Bp%5D=-3%2F4\" Multiply the fractions.
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\n" ); document.write( " So the perpendicular slope is \"-3%2F4\"
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\n" ); document.write( " So now we know the slope of the unknown line is \"-3%2F4\" (its the negative reciprocal of \"4%2F3\" from the line \"y=%284%2F3%29%2Ax%2B3\").\n" ); document.write( "Also since the unknown line goes through (3,-5), we can find the equation by plugging in this info into the point-slope formula
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\n" ); document.write( " Point-Slope Formula:
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\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 the given point
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\n" ); document.write( " \"y%2B5=%28-3%2F4%29%2A%28x-3%29\" Plug in \"m=-3%2F4\", \"x%5B1%5D=3\", and \"y%5B1%5D=-5\"
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\n" ); document.write( " \"y%2B5=%28-3%2F4%29%2Ax%2B%283%2F4%29%283%29\" Distribute \"-3%2F4\"
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\n" ); document.write( " \"y%2B5=%28-3%2F4%29%2Ax%2B9%2F4\" Multiply
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\n" ); document.write( " \"y=%28-3%2F4%29%2Ax%2B9%2F4-5\"Subtract \"-5\" from both sides to isolate y
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\n" ); document.write( " \"y=%28-3%2F4%29%2Ax%2B9%2F4-20%2F4\" Make into equivalent fractions with equal denominators
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\n" ); document.write( " \"y=%28-3%2F4%29%2Ax-11%2F4\" Combine the fractions
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\n" ); document.write( " \"y=%28-3%2F4%29%2Ax-11%2F4\" Reduce any fractions
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\n" ); document.write( " So the equation of the line that is perpendicular to \"y=%284%2F3%29%2Ax%2B3\" and goes through (\"3\",\"-5\") is \"y=%28-3%2F4%29%2Ax-11%2F4\"
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\n" ); document.write( " So here are the graphs of the equations \"y=%284%2F3%29%2Ax%2B3\" and \"y=%28-3%2F4%29%2Ax-11%2F4\"
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\n" ); document.write( "
\n" ); document.write( " graph of the given equation \"y=%284%2F3%29%2Ax%2B3\" (red) and graph of the line \"y=%28-3%2F4%29%2Ax-11%2F4\"(green) that is perpendicular to the given graph and goes through (\"3\",\"-5\")
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