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The more common idiom is "stiff as a board," meaning "very stiff." Unless used ironically, like "straight as a crooked stick" or "straight as a politician's promise," the expression "straight as a board" would mean "very straight." When referring to "straight as..........." the term usually is as straight as a die
What does it mean to simplify an algebraic expression?It means to take the problem to the lowest point you can take it to.
The graphical solution of two straight lines, if it exists, is a single point. If such a point exists, its mean will be itself.
Linear means that the largest power(index) in the expression, equation, inequality etc, =1
A point. Other shapes may not have straight sides but that does not mean that they do not have sides.