8. Evaluate the cost

Thomas went to the stationery shop and brought 3 notebooks and 4 pens for the cost of \(₹\)42. Sam went to the same stationery shop and brought 7 notebooks and 7 pens for the cost of \(₹\)91. Calculate the individual cost of a notebook and the cost of a pen using the elimination method.

 

 

The cost of a notebook \(= ₹\)

 

The cost of a pen \(= ₹\)