I need help with two questions. The first one is how to solve this problem. The second is that I started to prepare for the SAT, and I found that some of my classmates used books and others used websites to prepare for the SAT. I don’t know which method is more suitable for me. Can give me some suggestions or share your experience with me. Thanks.
Q:A point (8,2) lies on the graph of the function f in the xy -plane. If t is a constant and f(x)=t−x
, what is the value of t?