3 p + 3b = 45
11 b + 12 p = 177
12 b + 12 p = 180
Subtract the second equation from the third.
b = 3.
9 + 12 p = 177
12 p = 168
p = ?
$ 45= 3 books 3 Pens
$ 177= 11 Books 12 Pens
Cost of b=
P=
2 answers
I made a mistake near the end.
3p + 9 = 45
3p = 36
p = 12
3p + 9 = 45
3p = 36
p = 12