# Math

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\$ 45= 3 books 3 Pens
\$ 177= 11 Books 12 Pens

Cost of b=
P=

• Math -

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 = ?

• Math -

I made a mistake near the end.

3p + 9 = 45
3p = 36
p = 12

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