Question

5 textbook and 7 notebook cost rupees 550 there are 7 textbook and 5 notebook cost rupees 650 what is the cost of one textbook and one notebook​

Answer 1

Answer:

textbook = 75 , notebook = 25

Step-by-step explanation:

consider , textbook - x , and notebook - y

5x+7y= 550 equ.1

7x+5y= 650. equ.2

let addition the equ., we get ,

12x+12y= 1200 x+y = 100 equ.3

now substract the equ.1 and 2, we get,

-2x+2y= -100

-x+y = -50 equ.4

addition equ.3 and 4 ,we get

x+y=100

-x+y= -50

we get 2y = 50

y = 25

x + y = 100

x + 25 = 100

x = 100 -25

x = 75

Answer 2

1 notebook costs = 25
1 textbook costs = 75