Question

Siri bought 2 notebooks and 3 pens for Rs 90 . Lakshmi bought

4 notebooks and 5 pens for Rs 140. Form linear equations for the given
situation to find the cost of a pen and a notebook .​

Answer 1

Answer:

3 Pen +4 Notebook =110 rupees

 Multiply by 5,

 15 Pen +20 Notebook  =550 rupees

 7 Pen +5 Notebooks   =170 rupees

 Multiply by 4,

 28 Pen +20 Notebook  =680 rupees

 15 Pen +20 Notebook  =550 rupees

 Equating and solving for Pen,

 Cancelling notebook,

 13 Pen  =130 Hence,

 Pen  =10 rupees

Substituting,

 3(10)+4 Notebook =110

 4 Notebook =110−30 Hence,

 Notebook =20 rupees