Question

Cost of 2 Kg of rice plus Rs. 15 is equal to Rs. 50. Find the expression if r represents cost of 2 Kg.

Answer 1

Step-by-step explanation:

x 65 55 45 35

y 20 40 60 80

Let the cost of 1 kg of apples be x and that of 1 kg be y

So the algebraic representation can be as follows:

2x+y=160

4x+2y=300⇒2x+y=150

The situation can be represented graphically by plotting these two equations.

2x+y=160⇒y=160−2x

x 70 60 50 40

y=160−2x 20 40 60 80

2x+y=150⇒y=150−2x

x 65 55 45 35

y=150−2x 20 40 60 80

We can see that the lines do not intersect anywhere, i.e. they are parallel. Hence we can not arrive at a solution.

solution

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Video Explanation

Answer 2

cost of 2kg rice + 15 = 50

given , cost of 2kg rice = r

r + 15 = 50

r = 35

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