Siti spent a total of $198 on some plates and bowls. she bought 2 more plates than bowls. each plate cost $3 and each bowl cost $5. how many plates did siti buy?

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.