An equation consists of an equal sign, and an expression on each side of it. The equal sign states that the two parts are equal. Examples:
3 = 3
4 = 5
x + 1 = 7
(The first is true, the second is false, the truth of the third one depends on the value assigned to "x"; but all three are equations.)
An inequality is similar, but the equal sign is replaced by one of the following signs: less-than, less-than-or-equal, greater-than, greater-than or equal.
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equations have an = sign, inequalities do not
A system of equations can have any number of inequalities.
Inequalities are not reflexive. Inequalities are not commutative.
Equations have and can only have a = Inequalities have <, >, greater than or equal to, less than or equal to, or =
To solve it by coordinate graphs you would take a point from the line and plug in the X and Y value into the equations and or inequalities.