Question

20 POINTS FOR THIS!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

b=13 add 7 to both numbers then divide by 5

Answer 2

b = 13

Explanation:

the value of the discount is a constant, while the total cost of the books is a variable because it depends of the purchase

We can write this equation

5b - 7 = 58

Solve it

1) add 7 at both members

5b -7 + 7 = 58 + 7

5b = 65

2) divide both membera by 5

b = 13