college
posted by Kristie .
Translate to an equation:
r $2 roses and t $2.50 tulips total $30
graph the equation and use the graph to determie three different combinations of roses and tulips that total $30.

The subject is not college, nor at college level.
2r + 2.5 t = 30
Plot that straight line in a x,t coordinate graph.
Draw straight vertical ines from three x values of your choice and see at what t values the vertical line is intersected by the 2r + 2.5 t = 30 line.