1. Evaluating a Variable Expression To evaluate a variable expression:
substitute the given numbers for each variable.
use order of operations to solve.

2. Example # 1 n + (13 - n)  5 for n = 8
= 8 + (13 - 8)  (Substitute.)
=  (parentheses)
= (Divide l/r.)
= (Add l/r.)

3. Example # 2 8y - 3x2 + 2n for x = 5, y = 2, n =3
= 8    (Substitute.)
= 8    (exponents)
=   (Multiply l/r.)
=  (Multiply l/r.)
= (Multiply l/r.)
= (Subtract l/r.)
= (Add l/r.)

4. Example # 3: What is the value of -10 – 4x if x = -13?
-62
-42 42 52
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5. Example # 4: What is the value of 5k3 if k = -4?
-8000
-320
-60
320
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6. Example # 5: What is the value of if n = -8, m = 4, and t = 2 ?10
-10 -6 6
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