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Yes.
Yes.
When there is an ordered pair that satisfies both inequalities.
If it is joined by an "and" it does. If it is joined by an "or" it does not.
No. For example, the solution to x ≤ 4 and x ≥ 4 is x = 4.
A system of linear inequalities
Yes.
Yes.
Linear inequalities in one variable
When there is an ordered pair that satisfies both inequalities.
If it is joined by an "and" it does. If it is joined by an "or" it does not.
A linear inequality is all of one side of a plane. A quadratic inequality is either the inside of a parabola or the outside.
No. For example, the solution to x ≤ 4 and x ≥ 4 is x = 4.
They are not. An inequality cannot, by definition, be the same as an equation.
Linear Inequalities
0.4Y+5=1
yes