I need help with math: Which equation matches this table?

X 15 9 16 11 13
Y 11 5 12 7 9

1. y = x + 3
2. y = x - 3
3. y = x - 4
4. y = x + 4

3

Step-by-step explanation:

13-4=9

11-4=7

16-4=12

9-4=5

15-4=11

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5