Question

x-y=7
x+y=5
mehtod of elimation

Answer 1

Answer:

x-y=7 and x+y=5 (2)

x=7+y (1)

sub (1) in (2)

7+y+y=5

7+2y=5

2y=5-7

2y=-2

y=-1

sub y in (2)

x-1=5

x=6