Question

5pencil and 7pen together cost rs.50.whereas 7penc5pen together cost rs.46find the cost of one pencil and that of oonepen​

Answer 1

Hey there..

5x+7y=50

7x+5y=46

Adding the equations

12(x+y)=96

x+y=8

Subtracting the equations

2(y-x)=4

y-x=2

Therefore, 2y=10 and y=5

x=3

Thus the cost of one pencil is Rs 3 and the cost of one pen is Rs 5.

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