I am lost can you help me with this problem?
Z varies directly as x and inversely as y. If z=123 when x=6 and y=6, find z if x=7 and y=8.
------- Substituting 123 for Z (not z), 6 for x, and 6 for y
123 = k
------- Substituting 123 for k, 7 for x, and 8 for y