1) Linear equations follow the formula of y = mx + c, where m is the gradient of the line, and c is the y-intercept. A linear equation always ALWAYS has the equals to symbol " = " in it.
2) A linear inequality ... I'm not too sure how to explain this. Well, it's that equation which has the symbol " < " which means less than, or " > " which means more than. There is an additional variation to each of the symbols. An extra line under the symbol " < " means less than or equal to. An extra line under the symbol " > " means more than or equal to.