Evaluating a 2-Variable Expression
Evaluate Expressions: Learn
A mathematic expression is a group of numbers and operators which can be evaluated to determine their value.
There may be variables in the expression which represent numbers that may or may not be known. A variable is simply a symbol used as a placeholder for the unknown number.
If we know the values of the variables, we can find the value of the entire expression.
For example, if x=3 and y=5, then the expression 7x+y-4 can be evaluated in the following way:
7x+y-4 =7*3+5-4 =21+5-4 =22
The very first step where the variables are replaced by their values is called substitution.
Evaluate Expressions: Practice
Evaluate using the given value.
If x= and y=, then
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