Question

Solve each of the following equations by trial-and-error method: $4x=28$

Answer 1

Given the equation is $4x=28$.....(1).

Now by guessing put $x=6$ in (1) then we get,

$4\times 6=24\ne 28$, so $x=6$ is not a solution of (1).

Now put $x=7$ in (1) then we get,

$4\times 7=28$.

So $x=7$ is the correct solution.