Question

cost of a pencil is half the cost of a pen, if cost of 3 pens ànd 4 pencils together is ₹20/-, find the cost of a pencil and a pen using graphical method. also determine the co-ordinates of the vertices of the triangle formed by these lines and the x-axis, shade the triangular region​

Answer 1

Answer:

if the price of pencil is "x"

the price of a pen will be "2x"

so, according to the question,

3(2x) + 4x = 20

6x + 4x = 20

10x = 20

x = 20/10

x = 2

therefore,

■ the price of pencil = x = 2

■ the price of pen = 2x = 2 × 2 = 4