Answer:y is the variable
Step-by-step explanation:a variable is a letter in an algebraic equation or expression
Answer: -8 and -4
This is something you do through trial and error. Making a list or a table like shown below might help.
Answer:
512
Step-by-step explanation:
the number of subsets of the set {1, 2, 3, ..., 9} is : 2^9 = 512