Question

Solve for $x$ by using trial and error method: 3$x$ + 6 – 2 = 16

• A. 4
• B. -2
• C. 2
• D. 5

Answer 1

The correct option is A 4

The given equation is: 3$x$ + 6 - 2 = 16.
It can be simplified as 3$x$ + 4 = 16

If $x$ = 1, 3$x$ + 4 = 3 $\times$ 1 + 4 = 7.
If $x$ = 2, 3$x$ + 4 = 3 $\times$ 2 + 4 = 10.
If $x$ = 3, 3$x$ + 4 = 3 $\times$ 3 + 4 = 13.
If $x$ = 4, 3$x$ + 6 - 2 = 3 $\times$ 4 + 4 = 16. (i.e., L.H.S. = R.H.S)
Therefore, $x$ = 4 holds good for the given equation.