Question

5pencils and 7 pens togethet cost Rs50 whereas 7 pencils and 5 pens togethet cost Rs46.Find the cost of one pencile and that of one pen .Find their solutions graphically​

Answer 1

ANSWER:-

HY MATE HERE IS UR ANSWER

LET COST OF one pencil=x

Let Cost of 1Pen=y

then, 5x+7y=50-->(1)->×this with 7

also,7x+5y=46-->(2)->×this with 5

u get 35x+49y=350-->(3)

also,u get

35x+25y=230-->(4)

subtract (3)&(4)

|35x+49y=350

|35x+25y=230

|(-) (-) (-)

|_________________

0+24y=120

°•° y=120÷24

=y=5-->(5)

put (5)in(2)

7x+5y=46

=7x+5×5=46

=>7x+25=46

_->7x=46-25

->7x=21

#x=21÷7

°•°x=3

=>x=3&y=5

#1pencil cost =3

#1pen cost=5

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