Question

5pencils and 7pens together cost ₹50,where7 pencils and 5 pens together cost rupees 46 find the cost of one pencil that of one pen (USEING SUBSTITUTION METHOD ONLY) I NEED THE ANSWER SOON ONLY BY SUBSTITUTION METHOD

Answer 1

Answer:

5pen 3pencil

(5pencil+7pen=50)×7

(7pencil+5pen=46)×5

35pencil+49pen=350

35pencil+25pen=230

-

24pen=120

1pen=__120___

24

5pen

similarly pencil =3

Answer 2

Sol:

Let the price of one pencil be x and cost of one pen be y.

5x+7y=50 ...........(ı)

X=50-7y/5

7x+5y=46 ................(ıı)

On putting themail value of x in equation (I),we get

350-49y+25y=230

---24y=120

y=5

On substitute the value of y in eq(ı),we get

X=3

Hence

The cost of pencil is 3 and cost of pen is 5.