Transcript text: This graph shows how the total number of hats Kira can knit relates to the number of skeins of yarn she buys. The variable $x$ represents the number of skeins of yarn she buys, and the variable $y$ represents the number of hats she can knit.
What is the equation of the line in slope-intercept form?
Write your answer using integers, proper fractions, and improper fractions in simplest form.