It can mean any number.
Example 1: 3x+4x=?
=7x
Example 2: 3x+4x+7=?
=7x+7
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it means you're multiplying them.
variables
Lots of letters and numbers
y axis ___________________________________ The letters X, Y and Z often refer to unknown or "variable" quantities, and the purpose of solving the algebra problem is to determine the precise value of these variables.
It could be any number. But it couldn't just be a 'b' it could be other letters. The letters is just a grown up way of saying a missing number. Its like saying: 10+b=11.. 11-b=10.. therefore b=1