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Question -

Solve the following equations by trial and error method:

(i) 5p + 2 = 17

(ii) 3m – 14 = 4



Answer -

(i)

LHS = 5p + 2

By substituting thevalue of p = 0

Then,

LHS = 5p + 2

= (5 × 0) + 2

= 0 + 2

= 2

By comparing LHS andRHS

2 ≠ 17

LHS ≠ RHS

Hence, the value of p= 0 is not a solution to the given equation.

Let, p = 1

LHS = 5p + 2

= (5 × 1) + 2

= 5 + 2

= 7

By comparing LHS andRHS

7 ≠ 17

LHS ≠ RHS

Hence, the value of p= 1 is not a solution to the given equation.

Let, p = 2

LHS = 5p + 2

= (5 × 2) + 2

= 10 + 2

= 12

By comparing LHS andRHS

12 ≠ 17

LHS ≠ RHS

Hence, the value of p= 2 is not a solution to the given equation.

Let, p = 3

LHS = 5p + 2

= (5 × 3) + 2

= 15 + 2

= 17

By comparing LHS andRHS

17 = 17

LHS = RHS

Hence, the value of p= 3 is a solution to the given equation.

(ii)

LHS = 3m – 14

By substituting thevalue of m = 3

Then,

LHS = 3m – 14

= (3 × 3) – 14

= 9 – 14

= – 5

By comparing LHS andRHS

-5 ≠ 4

LHS ≠ RHS

Hence, the value of m= 3 is not a solution to the given equation.

Let, m = 4

LHS = 3m – 14

= (3 × 4) – 14

= 12 – 14

= – 2

By comparing LHS andRHS

-2 ≠ 4

LHS ≠ RHS

Hence, the value of m= 4 is not a solution to the given equation.

Let, m = 5

LHS = 3m – 14

= (3 × 5) – 14

= 15 – 14

= 1

By comparing LHS andRHS

1 ≠ 4

LHS ≠ RHS

Hence, the value of m= 5 is not a solution to the given equation.

Let, m = 6

LHS = 3m – 14

= (3 × 6) – 14

= 18 – 14

= 4

By comparing LHS andRHS

4 = 4

LHS = RHS

Hence, the value of m= 6 is a solution to the given equation.

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