(3, 1)
substitute each ordered pair into the left side of the equation and if equal to the right side then it is a solution
(4, 1 )
(4 + 6) × 1 = 10 × 1 = 10 ≠ 9 ← not a solution
(2, 1 )
(2 + 6 ) × 1 = 8 × 1 = 8 ≠ 9 ← not a solution
(3, 1 )
(3 + 6 ) × 1 = 9 × 1 = 9 ← hence a solution
(12, 2 )
(12 + 6 ) × 2 = 18 × 2 = 36 ≠ 9 ← not a solution
