Question

Solve the following pair of linear equations elimination method :
3x + y = 15,
2x - y = 5.​

Answer 1

Answer:

let 3x+y=15 be 1eq

2x-y=5 be 2eq

1eq+2eq

5x=20

x=4

y=3

Answer 2

3x + y = 15 .... (1)

2x - y = 5 .... (2)

Add equation (1) & (2)

3x + y = 15

2x - y = 5

-----------------

5x = 20

Now

• 5x = 20

• x = 20/5

• x = 4

Put x=4 in equation (1)

• 3(4) + y = 15

• 12 + y = 15

• y = 15 - 12

• y = 3