solve by elimination method...

Question

How do u solve x-y=2 and x+y=1?

Answer 1

Given that x - y = 2 -->1

x + y = 1-->2

Add equation 1 and equation 2

x - y + (x + y) = 2 + 1

2x = 3

x = 3/2

Substitute x = 3/2 in equation 2

3/2 + y = 1

y = 1 - 3/2

y = ( 2 - 3 )/2

y = -1/2

Therefore x = 3/2 and y = -1/2