neither. +3 is just a number.
Examples of expressions are: x+5, u+9, 5-1
Examples of equations are:x2+2x+3=0, u2-19u-1=5x
Sorry supervisor.
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An equation demonstrates the equality of two expressions. x2+12x+13 is only one expression. For example, x+y : expression, not equation x+5 = 3 : equation
3x plus 2y - 3 is an expression. There can be no answer to one expression and one linear equation in two variables.
an expression
The question contains an expression, not an equation. An expression does not have a graph. Furthermore, even if it were an equation, its form suggests that it would be a linear equation and a linear equation does not open in any direction.
You cannot. What you have in the question is an expression. An expression cannot be proven. You need an equation (or inequality).