None. Brackets are used as an alternative to parentheses. Using different symbols makes it easier to locate matching parentheses or brackets.
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They are the same.
2nd [CATALOG], solve( , enter equation, variable and guess after the bracket, close brackets with " ) ". You can also put lower and upper bounds after the guess.
By substitution
They are alike in that you graph the lines in the same way, but they are different because you have to shade in one side of the line
In an inequality, you have to shade a side of a line to see show if the possible answers are greater than or equal to it