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Sticky Note
If x + y = 10, x - y = 10, then x = _____?
  1. 10
  2. 12
  3. 11
  4. None of these
Explanation

Step 1: Add the two equations to eliminate y

(x + y) + (x - y) = 10 + 10

2x = 202x = 10

Step 2: Solve for x

x = 20/2x = 10

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  1. -16
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