evalauting the expression
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They are known as ratios.
Replace each variables in the algebraic expression by its [known] value and calculate the value (ie evaluate) of the algebraic expression.
The variables have no known values and as an expression it is: 5x+9y+5
A constant in an algebraic expression is a number that does not change. For example x + 2 The 2 is a constant (does not change) x is a variable (can take on any value)
Just 2. The letters are all known as variables and the numbers are just numbers. Even though there are different numbers and letters, they all represent the same things.