Express the statement as a formula. t is jointly proportional to the quantities x and y inversely proportional to r. Determine if the table is either true or false where c is given as the constant of proportionality. x y r t c 9 -45 9 45 -1 27 90 -18 270 2 45 -135 27 1,125 5

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Equations and inequalities describe the relationship between two mathematical expressions.

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A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.