Question

The total price of two pens and five notebooks is Rs 188. Two pens and eight notebooks together costRs 284. What is the price of a notebook? What is the price of a pen?​

Answer 1

Step-by-step explanation:

 book, notebook, pen be x, y, z respectively.

2x+6y+3z=40

3x+4y+2z=35

5x+7y+4z=61

⎣⎢⎢⎡235647324⎦⎥⎥⎤⎣⎢⎢⎡xyz⎦⎥⎥⎤=⎣⎢⎢⎡403561⎦⎥⎥⎤

Apply R1→R1−R2

⎣⎢⎢⎡−135247124⎦⎥⎥⎤⎣⎢⎢⎡xyz⎦⎥⎥⎤=