Find the maximum and minimum values from the expression 7x

Find the maximum and minimum values from the expression:

7x + 2y

given these points:

(3,9), (1,2), (6,8), (10,4)

Solution

7x + 2y

(3, 9) :
7 * 3 + 2 * 9
21 + 18
39

(1, 2) :
7 * 1 + 2 * 2
7 + 4
11

(6, 8) :
7 * 6 + 2 * 8
42 + 16
58

(10, 4) :
7 * 10 + 2 * 4
70 + 8
78

Maximum value = 78
Minimum value = 11