A system of linear inequalities give you a set of answers that could work. In day to day lives we actually use linear inequalities all the time. We are given questions and problems where we search for a number of possible solutions.
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There is no inequality in the question so there cannot be an answer.
No it is not if you have a single inequality. It you had a single point as the solution, then it effect you would have an equality. If you have x> or equal to 1 and x< or equal to 1 then the graph is the single point 1. So it is possible with systems of inequalities.
5x + 3y + 6 is an algebraic expression. It is not an equation (or inequality) and so cannot be solved. In any case, one linear equation with two variables cannot be solved.
You can't simplify that. And you can only calculate a numeric value if you know what values the variables have.
A foot IS a linear measure so a foot is a linear foot. So 84 linear feet is 84 feet.