Question

Find the solution for the equation $4y=20$ by trial and error method.

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

The correct option is D 5

Given equation is $4y=20$

Substituting value ($y$)	Value of LHS (4$y$)	Value of RHS (20)	Whether LHS and RHS are equal
1	= 4$\times$1 = 4	20	No
2	=4$\times$2 = 8	20	No
3	=4$\times$3 = 12	20	No
4	=4$\times$4 = 16	20	No
5	=4$\times$5 = 20	20	Yes

As LHS=RHS for $y$ = 5,
Hence $y$ = 5 is the solution of the given equation.