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All, thank you! WD, I now thoroughly understand the process and my error. An artist brain attempting to cross over to the other hemisphere.
X and Y Cost $13.90
X is $13.00 more than Y
How much does Y cost
Y = .45C
Or as Wook
X + Y = 13.90
bat = ball + 13.00
Substituting the bottom line into the first line you get
Y+ 13.00 + X = 13.90
Solving this
(2)y = .90
X = .45
Substituting the X info into the first line
Y + .45 = 13.45
bat = .45
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