Lashonda purchased a prepaid phone card for $30. Long distance calls cost 12 cents a minute using this card. Lashonda used her card only once to make a long distance call. If the remaining credit on her card is $ 28.32, how many minutes did her call last?

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for