An ordered variable is one where you can put the data into order, but not give it an actual number. The height of plants compared to each other is an ordered variable, e.g the plants growing in the woodland are taller than those on the open field.
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Sure. You can always 'solve for' a variable, and if it happens to be the only variable in the equation, than that's how you solve the equation.
variable c
4 sin(6x) cos(6x) is already a function of a single variable. The variable is ' x '.
Substitute the values of the ordered pair into the relation. If the equation is valid then the ordered pair is a solution, and if not then it is not.
function is the relationship between independent variable & dependent variable i.e. F:R-R