Question

cost of 5 pens and 6 pencil is Rs 39 and cost of 6 pens and 5 pencil is Rs49 then find the cost of 2pens and 2pencil?

pls solve with prove ​

Answer 1

PENS=X

PENCIL=Y

5X+6Y=39

6X+5Y=49

X=9

Y=-1

THERFORE 2X+2Y=18-2=16

Answer 2

let pencils be y

pens be x

5x+6y=39

6x+5y=49

6(5x+6y=39)

=30x+36y=234

5(6x+5y=49)

=30x+25y=245

30x+36y=234

30x+25y=245

11x=-11

x=9

y=-1

2x+2y=16