Multiple choice

Let K be the solution of the linear equation 3x - 21 = 7x - 29 and M be the solution of the linear equation 2y + 6 = y + 12. Now, if 2z + M = K, then the value of z is

  1. -2

  2. -4

  3. 4

  4. -1

  5. None of these
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A Correct answer
Explanation

3x - 21 = 7x - 29 Or, 4x = 8 Or, x = 2 = K Also, 2y + 6 = y + 12 Or, y = 6 = M Now,  2z + 6 = 2 Or, 2z = - 4 Or, z = - 2 Ans.

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