Question

Three pens and four exercise books cost sh.87. Two pens and five exercise books cost sh.93. Find the total cost of one pen and one exercise book. *​

Answer 1

Step-by-step explanation:

Let the cost of an exercise book be Rs.x

Let the cost of a pencil be Rs.y

2x+3y=17 Blue line

3x+4y=24 Red line

Corresponding graph is shown in the attached figure. From the graph, it can be seen the solution is x=4,y=3.

Hence, the cost of exercise book is Rs.4 and that of a pencil is Rs.3.