What is the y intercept?

Answer:
-4
Step-by-step explanation:
If you count down the y-axis to the line, it would be 4. And since you're on the negative side then its -4.
-4.
The answer to your question is -4, please ignore my previous comment.
The reason behind my answer is because y intercept is what the blue line is going through on the y-axis. If you take a look at the chart you'll see that the line goes through -4 on the y-axis.