Question

Solve step by step: 2x + 3 = 9 by trial and error method ​

Answer 1

Given:

2x + 3 = 9

Now solving it step by step.

So,

There is only one variable here. i.e. the degree of the variable is 1.

Solving,

2x + 3 = 9

⇒ 2x = 9 - 3

[By transporting (3) to RHS]

⇒ 2x = 6

⇒ x = 6 ÷ 2

[By transporting (2) to RHS]

⇒ x = 3

Thus the value of x is 3

.

SIMPLE METHOD,

2x + 3 = 9

⇒ 2x + 3 - 3 = 9 - 3

⇒ 2x = 6

⇒ 2x ÷ 2 = 6 ÷ 2

⇒ x = 3

VERIFICATION:

LHS = 2x + 3

Now putting the value of x = 3,

2(3) + 3

= 6 + 3

= 9 = RHS

Hence

LHS = RHS

Verified

Answer 2

Putting x as 3

2(3) + 3 = 9

➝ 6 + 3 = 9

➝ 9 = 9

So , 9 satisfies this equation