x represent the number of bats
y represent the number of balls
The inequalities are
x ≥ 4
y ≥ 8
15x + 5y ≤ 120
To determine the combination that the coach should buy, we would substitute the values of x and y in the different combinations. We have
For x = 6, y = 10
15(6) + 5(10) = 140
This is greater than 120
For x = 3, y = 10,
15(3) + 5(10) = 95
This is less than 120 but x is less than 4
For x = 4, y = 9,
15(4) + 5(9) = 105
The cost is less than 120 and the conditions for x and y are satisfied. Thus, the correct option is
4 bats,