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?
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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⎦⎥⎥⎤=
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