Final answer:
With the provided information, we cannot determine the value of HY as there is no context or additional details connecting HY to YL.
Step-by-step explanation:
The provided information is incomplete to determine the value of HY as there is no information given regarding the relationship between HY and YL. YL is given as 9, but without additional context or a diagram indicating whether HY and YL are segments of a line, sides of a geometric figure, or part of an algebraic expression, we cannot solve for HY.
Normally, if HY and YL were consecutive segments of a straight line with Y being the point where the segments meet, HY + YL would equal the total length of the straight line segment HYL. If this were the case and we knew HYL, we could calculate HY. However, since such information is not provided, HY cannot be determined from the information given.