Posted by julie on Thursday, January 6, 2011 at 1:41am.
Total length (given) ie. a+b = 100
a = b + 18
We can rewrite this b = a -18
Now solve it the normal way.
substitute for b in the first equation
a + b = 100
a + a - 18 = 100
2a -18 = 100
2a = 100 + 18
2a = 118
a = 59
To get b:
go to equation and apply value of a in b = a -18
b = 59- 18
ie. b = 41
a + b should be = 100
a= 59 b = 41
59 + 41 = 100 !
Done! Hope this helps.
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