Question

Solve the pair of linear equations x - 2y = 0, 3x +4y = 20​

Answer 1

Answer:

Hence x= 5 and y = 5/2

Step-by-step explanation:

Given: x-2y=0

3x+4y=20

x-2y=0

3x+4y=20

 2x-2y=0

 3x+4y=20

2x-4y=0

5x=20

x=5

5-2y=0

-2y=-5

2y=5

y=5/2

Hence x= 5 and y = 5/2

Answer 2

Answer:

x= 5 and y = 5/2

Step-by-step explanation:

Given: x-2y=0

3x+4y=20

We need to find the values of x and y

x-2y=0 ————-(i)

3x+4y=20————-(ii)

Multiplying Equation (i) by 2 we get

2x-2y=0———–(iii)

Solving equations (ii) and (iii) we get,

3x+4y=20

2x-4y=0

_________

5x=20

x=5

Substituting the value of x in equation (i) we get,

5-2y=0

-2y=-5

2y=5

y=5/2

Hence x= 5 and y = 5/2