question 3 - open up to see pic

(12, 11):
2((12) + 3) - (11) = 7 + (12)
2 • 15 - 11 = 19
2 • 4 = 19
8 [tex]\neq[/tex] 19
(1, 0):
2((1) + 3) - (0) = 7 + (1)
2 • 4 = 8
8 = 8
(-5, 1):
2((-5) + 3) - (1) = 7 + (-5)
2 • -2 - 1 = 2
2 • -3 = 2
-6 [tex]\neq[/tex] 2
Hope this helps.