Question

Solve each of the following equations by trial-and-error method: $x-7=10$

Answer 1

Given the equation is $x-7=10$.....(1).

Now by guessing put $x=16$ in (1) then we get, $16-7=9$, which is close to $10$.

Now put $x=17$ in (1) then we get, $17-7=10$, which is required.

So $x=17$ is the correct solution.