document.write( "Question 181821: For Points P(-3,5) and Q(1,3) find (a)PQ and (b)the midpoint of PQ \n" ); document.write( "

Algebra.Com's Answer #136470 by Alan3354(69443) $\"\"$ $\"About$

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For Points P(-3,5) and Q(1,3) find (a)PQ and (b)the midpoint of PQ
\n" ); document.write( "---------------
\n" ); document.write( "The easiest way to do these is to find the average of x and y separately.
\n" ); document.write( "(x1+x2)/2 = (-3+1)/2 = -1
\n" ); document.write( "(y1+y2)/2 = (5+3)/2 = 4
\n" ); document.write( "The midpoint is (-1,4)
\n" ); document.write( "-----------------
\n" ); document.write( "The length of PQ is (using Pythagoras):
\n" ); document.write( " $\"sqrt%28%28diffy%29%5E2+%2B+%28diffx%29%5E2%29\"$
\n" ); document.write( "= $\"sqrt%28%283-5%29%5E2+%2B+%281%2B3%29%5E2%29\"$
\n" ); document.write( "= $\"sqrt%284+%2B+16%29\"$
\n" ); document.write( "= $\"sqrt%2820%29\"$
\n" ); document.write( "= $\"2sqrt%285%29\"$
\n" ); document.write( "=~ 4.472 \n" ); document.write( "

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