Question

3. Solve the following equations by trial and error method: (i) 7x - 13 = 15 [NCERT​

Answer 1

Step-by-step explanation:

i) 7x - 13 = 15

Using Hit and trial method,

For x=1

LHS = 7-13 = -6, LHS is not equal to RHS

For x=2

LHS = 7×2 - 13 = 1, LHS =/= RHS

For x=4

LHS = 7×4 - 13 = 28-13 = 15 = RHS

Hence, x=4 is the answer.

Answer 2

Answer:

x = 4

Step-by-step explanation:

Taking x = 1, we get;

(7*1) - 13 = 15

7 -13 =15

-6 ≠ 15

Taking x = 2, we get;

(7*2) - 13 = 15

14-13 = 15

1 ≠ 15

Taking x = 3, we get;

(7*3) - 13 = 15

21 -13 = 15

8 ≠ 15

Taking x = 4, we get;

(7*4) - 13 = 15

28 -13 = 15

15 = 15

∴ x = 4.

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