The question will always tell you what the symbols means. Read the question carefully and then plug in the numbers.
Example 1:
What is the value of
Solution:
Step 1: Plug in
Step 2: Plug in x = 4
Step 3: Add the two
Answer:
Example 2:
If
, what is the value of k?
Solution:
Step 1: Plug in x = 4 and y = 5
Step 2: Plug in x = k and y = 10
Step 3: Equate the two
Answer: 8
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