Answer :
set x to set y to be a function if each member of set x pairs is exactly one member of set y
set x: 10, -10, 2, 3
set y: 3, -3, -2, -10
so the relation is a function
set x to set y to be a function if each member of set x pairs is exactly one member of set y
set x: 10, -10, 2, 3
set y: 3, -3, -2, -10
so the relation is a function