Question

Solve: 2x + y = 5 and 3x – y = 15.​

Answer 1

Answer:

2x + y = 5...(1)

3x - y = 15 ...(2)

(1)+(2)

2x+ y = 5

3x - y = 15

_________

5x = 20

_________

x = 20/5

x = 4

sub x = 4 in (1)

2x+ y = 5

2*4 + y = 5

8+ y = 5

y = 5-8

y = -3