You are told that a random sample of 150 people from iowa has been given cholesterol tests, and 60 of these people had levels over the "safe" count of 200. construct a 95% confidence interval for the population proportion of people in iowa with cholesterol levels over 200. what is the upper value of the confidence interval?

The answer is y=5. This is because x=-2 is basically a vertical line, so its perpendicular line is horizontal. This means it is parallel to the x-axis and has only one y variable for every x value. Because in the point you are given the y value is 5, it means that the slope is y=5.