Answer
$y=\frac{1}{3}x$
Work Step by Step
Let x be the number of sides and let y be the number of triangles.
"Is $\frac{1}{3}$" tells us to multiply the number of sides by $\frac{1}{3}$ to find the number of triangles.
$y=\frac{1}{3}x$
Create a table with some values that satisfy the equation.
$\underline{sides, x}\ \ \ \underline{triangles, y}$
$\ \ \ \ \ \ \ 3\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 1$
$\ \ \ \ \ \ \ 6\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 2$
$\ \ \ \ \ \ \ 9\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 3$
Plot the points in the table. Plot other points that lie on the imaginary line connecting the points. Only plot points at whole values of x that are a multiple of 3 since the number of triangles cannot be fractional.
