1.

If x = 7, y = 4, z = 9, then which of the following is TRUE?I. x + y + z = 20II. x - y + z = 13III. x + y - z = 3IV. -x + y - z = -12A. I and IIB. III and IVC. I and IVD. I and III1. A2. D3. C4. B

Answer» Correct Answer - Option 3 : C

Given:

x = 7, y = 4, z = 9

Calculation:

I. x + y + z = 20

LHS,

x + y + z = 7 + 4 + 9

⇒ x + y + z = 20

LHS = RHS

II. x – y + z = 13

LHS,

x – y + z = 7 – 4 + 9

⇒ x – y + z = 12

LHS ≠ RHS

III. x + y – z = 3

LHS,

x + y – z = 7 + 4 – 9

⇒ x + y – z = 2

LHS ≠ RHS

IV. -x + y – z = -12

LHS,

-x + y – z = -7 + 4 – 9

⇒ -x + y – z = -12

LHS = RHS

I and IV are TRUE.



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