Question

Shyam the pair of linear equations of the following problems and find the solution graphically 5 pencils and 7 pens together cost Rupees 50 whereas 7 pencils and pens together cost rupees 46 find the cost of one pencil and that of one pen​

Answer 1

Answer: Cost of one pen is 3 rupees, cost of one pen is 5 rupees.

Step-by-step explanation:

Let the cost of each pencil be x and the cost of each pen be y.

According to the question,

5x+7y=50 -equation 1

7x+5y=46 -equation 2

From equation 1,

5x+7y=50

5x=50-7y

x=(50-7y)/5

Substituting the value of x obtained from equation 1 in equation 2, we get

7{(50-7y)/5}+5y=46

(350-49y)/5+5y=46

70-(49/5)y+5y=46

70-46=(49/5)y-5y

24=9.8y-5y

24=4.8y

y=24/4.8=5

y=5

x=(50-7y)/5

x=(50-7*5)/5

x=15/5=3

So, cost of one pencil is 3 rupees

Cost of one pen is 5 rupees

Answer 2

ur answer is up dear it's an easy one