Can you guess which function this is?

☕︎ which word is this ? ∆ ❂▲e▼❂e #Puzzle #puzzletime #puzzlegame

☕︎ a ⊙ b = 9 a Δ b = 14 a ? b ? a,b ∈ [0, 9], integers ⊙, Δ can be +, x or - #math #Mathematics #puzzle

a ⊙ b = -6 a Δ b = 10 a ? b ? a,b ∈ [0, 9], integers ⊙, Δ can be +, x or - #math #Mathematics #puzzle

a ⊙ b = 7 a Δ b = 11 a ? b ? a,b ∈ [0, 9], integers ⊙, Δ can be +,x or - #math #Mathematics #puzzle