please provide explanation for answer

Question 2 1 pts For which values of a, b E N, does the set p = {(x, y) E Z x Z : ax + by = 8} define a function? a=4, b=2 [ Select ] a=3, b=2 [ Select ] v a=12, b=6 [ Select ] v a=8, b=8 [Select ] a=3, b=6 [Select ] Select ] Yes, it does No. it doesn't