Question

Solve each of the following equations by trial and error method:

(iii) $3x=18$

Answer 1

Put different values of $x$ in such a way that L.H.S = R.H.S

Let us put $x=2$ in $3x$, we have

$3\times 2=6$ which is not equal to $18$

So, $x=2$ is not the solution of given equation.

Let us put $x=4$ in $3x$, we have

$3\times 4=12$ which is not equal to $18$

So, $x=4$ is not the solution of given equation.

Let us put $x=6$ in $3x$, we have

$3\times 6=18$ which is equal to $18$

So, $x=6$ is the solution of given equation.

Hence, By Hit and trial method $x=6$ is the solution of given equation.