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If and , then find the value of .

  1. A
    9
  2. B
    1
  3. C
    -9
  4. D
    -1

Solution & Step-by-step Explanation

We are given a system of two linear equations: Multiply equation (2) by 2 to match the coefficients of :

Add equation (1) and equation (3):



Substitute back into equation (2):



Now evaluate the required expression :

Practice this question

Try it yourself before checking the explanation above.

If and , then find the value of .
A
9
B
1
C
-9
D
-1

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