Its the Equal sign =
If there is no = sign it is an expression but if there is an = sign it is an equation
If it doesn't have an equal sign, then it's not an equation.
Yes, it does. An equation is something that equates something to something else, by means of the 'equals' sign.
An equation
An expression has no equal sign whereas an equation does have an equal sign
If it doesn't have an "equals" sign, then it's not an equation. It's an "expression".
An expression does not have an equals sign, An equation has an equals sign,
An equation has an equal sign, a expression does not.
an equation is a number sentence with and = sign
It is the equality sign that makes it an equation because without the equality sign it would be an algebraic expression.
Yes, when the inequality has a less that or equal to sign, or a greater than sign or equal to sign, then the equal sign can be replaced and get a solution that is common to both the equation and the inequality. There can also be other solutions to the inequality, where as the solution for the equation will be a valid one.
It is an expression because an equation is two equal expressions separated by an equality sign.