For which value of ttt are ⟨t,6⟩\langle t, 6 \rangle⟨t,6⟩ and ⟨2,−3⟩\langle 2, -3 \rangle⟨2,−3⟩ orthogonal?
t=3t = 3t=3
t=9t = 9t=9
t=−9t = -9t=−9
t=−3t = -3t=−3