The cost of 2 kg of apples and 1kg of grapes on a day was found to be Rs 160.

Let cost of 1 kg of apples = Rs x and let cost of 1 kg of grapes= Rs y

According to given conditions, we have

2x + y = 160… (1)

4x + 2y = 300

⇒ 2x + y = 150… (2)

So, we have equations (1) and (2), 2x + y = 160 and 2x + y = 150 which represent given situation algebraically.

For equation 2x + y = 160, we have following points which lie on the line

Algebraic representation :
2x+y = 160 ………………(i)
4x+2y= 300……………..(ii)
Graphical representation :

We plot the points for both of the equations and it is the graphical representation of the given situation.