Ans 1:
Class : Class 7
An equation is a type of algebraic format which has an 'equals to' sign (=). It contains one or more variables. It also contains constants like 2 in the below given equation.
For example:
2m+n=16
Ans 2:
Class : Class 7
Simple equation is equality between LHS and RHS . It has a equal to sign (=) and a variable.For example 2x=8
Ans 4:
Class : Class 8
A simple equation is a statement of equality between two expressions containing constants and variables.