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