Answer:
3b - 6 = 45 and b = 17
Explanation:
3b - 6 = 45 is your equation you get
3b is how many books you bought and the price multiplied by one another, then subtracting 6 gives you the discounted price which is 45
3b - 6 = 45
+6 +6
3b = 51
/3 /3
b = 17
a book costs 17 dollars.
so b = 17