Question

If x+y=2 and x-y=1 then:

Answer 1

X + y = 2

x - y = 1 

Adding the equations,

x + y + x - y = 2 + 1

2x = 3

x = $\frac{3}{2}$

x + y = 2

y = 2 - x

y = $2 - \frac{3}{2} = \frac{4-3}{2} = \frac{1}{2}$