Geometry
posted by Anonymous .
Solve for x
5/3 / 4/3 = x / 20/9
x= 25/9 =2.77777....
5/4 = x/3
x= 15/4 = 3.75
20/36 / 21/x
x= 189/5 = 37.8
x/6 = x+1 / 9
x= 2
Tell whether the lines are parallel based on the given proportions
(I think they are supposed to come out equal in order for the lines to be parallel)
16/4 = 8/2
32=32
yes, the lines are parallel
10/4 = 12.5 / 5
50 does not equal 5.1, therefore no, the lines are not parallel
15/34 = 16/35
525 does not equal 544, therefore no, the lines are not parallel
12/9 = 20/15
180=180
yes, the lines are parallel
Are my answers correct?

Geometry 
Reiny
yes, except
20/36 / 21/x
x= 189/5 = 37.8
seems to have a typo, no original equation
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