Question

Solve the equation 5p + 2 = 17 by trial and error method.
(2 marks)

Answer 1

Putting 1 in the equation
LHS = 5 times 1 + 2 = 5×1 + 2
= 5 + 2
= 7, which is not equal to RHS.
(0.5 marks)

Putting 2 in the equation
LHS = 5 times 2 + 2 = 5×2 + 2
= 10 + 2
= 12, which is not equal to RHS.
(0.5 marks)

Putting 3 in the equation
LHS = 5 times 3 + 2 = 5×3 + 2
= 15 + 2
= 17, which is equal to RHS.
(0.5 marks)

As LHS=RHS

p = 3 is the solution
(0.5 marks)