Question

U S
Find the number
31. The progressive club help needy students by giving free text books and stationary item.
The club purchased 5 books and 7 pens together cost Rs. 79, whereas 7 books and 5 pens
together cost Rs.77 (1) Find the cost of 100 books and 100 pens. (it) Which
mathematical concept is used in the above problem? (i) By denoting books and
stationery items to needy students, which value is depicted by progressive club?
AN110 11​

Answer 1

Answer is here aac to question we have to assume cost of 1 book be x and cost of 1 pen be y

Answer 2

Step-by-step explanation:

let the books be x and pens be y

5x+7y=79 ---------(1)

step 2:

7x+5y=77----------(2)

frm 1 and 2

5x+7y=79

7x+5y=76

the value of x=6

the value of y=7

(1)=100x+100y=?

100 (6)+100(7)

600+700

1300.

the vost for 100 books and 100pens is 1300

(2)=liner pair of equation

(3)=