57.50 - 8 = 49.50 more she needs to save
49.50 / 4.50 = 11
she needs to save for 11 weeks
(2,-4) is new reflected coordinates
(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
The sum of 4 and 8 is equal to 12. In this case, we are asked to determine the number that has the most accurate estimation to the addition of the two numbers. In this case, the answer should be 10. Numbers such as 5, 20 and 25 are really far from 12.
