Answer:
y = 3.5
Explanation:
The line y = 15 is a horizontal line that passes through the point (0,15) on the y-axis. Every point on this line has y-coordinate 15.
A line parallel to a horizontal line is also a horizontal line. Since the line we need passes through the point (1, 3.5), then all points on that line also have y-coordinate 3.5.
Answer: y = 3.5