Question 786164
Looking at B(6,3) and D(6,5), I have the same {{{ x }}}
for each, but a different {{{ y }}}. That makes it a vertical 
line and the length is just the difference in the {{{ y }}}
values, so length = {{{ 5 - 3 = 2 }}}
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To be a parallelogram, AC must also be a vertical line
of length = {{{ 2 }}}. I know so far that I have
A(3,2) and C(3,y) .
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It looks to me like {{{ y = 4 }}} and {{{ y = 0 }}}
would both work, So, 
C(3,4) and C(3,0) would both make the length of 
line AC = {{{ 2 }}}.
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Hope I got it