Question

8. Form pair of linear equation in two variables using the given statement.
The cost of a bulb is twice that of a lamp; the cost of a bulb and lamp together is Rs. 25.

Answer 1

Answer:

2x+x=25

Step-by-step explanation:

let the cost of bulb be 2X

let the cost of lamp beX

2X+X=25

therefore 2x+x=25

3X=25

X=25/3

X= 8.33

Answer 2

Given:-

Let the cost of a bulb be Rs. x

Let the cost of a lamp be Rs. y

According to the question :-

Cost of a bulb = twice that of a lamp

x = 2y

Again:-

Together the cost of a bulb and lamp together is Rs. 25

So:-

x + 2y = 25

Therefore:-

x + 2y = 25 is a linear equation in two variables to represent this statement.