Exercise 12 Page 250

We have been given the following information.

• Figure 1: $1$ big triangle and $3$ small triangles.
• Figure 2: $4$ big triangles and $12$ small triangles.
• Figure 3: $9$ big triangles and $27$ small triangles.

The table shows us another tool for organizing the given information, the total number of small triangles $y$ and figure numbers $x.$ We are asked to represent the relationship using words, an equation, and a graph.