Question

Formula a pair of linear equations in two variables 3 pens and books together cost of rs 50 where as 5 pens and 3 books together cost of rs 54

Answer 1

Step-by-step explanation:

1........ pens=X & books=Y

3pens=3x

3books=3y

total cost=50 therefore, 3x+3y=50........(1)

2....5pens=5x

3books=3y

total cost=54. therefore, 5x+3y=54....(2)

3x+3y=50.......1

5x+3y=54......2

eg(2)-(1)

5x+3y=54

-

3x±3y=50

2x=4

x=2÷4

x=2...............put x=2 in eq 2

5(2)+3y=54

10+3y=54

3y=55-10

3y= 45

therefore y=15

(x,y) = (2,15)

Answer 2

Answer:

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