Well, if you solve the equation for "y", you have "y" as a function of "x". Or you can do it the other way round; solve for "x", to get "x" as a function of "y" (the first option is more commonly used, though).
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20/25 equals 0.8
ln(a) = 5.3 a = e5.3
$48x + 5y" is an expression. It is not a function and so cannot be written as a function.
a = 8, b = 14.
y = 0.5x - 0.3