Solve for x and y: x+y=5 x-y=a

x=5/2 + a/2, y = 5/2 - a/2

Step-by-step explanation:

We can solve this system using addition of the equations

x+y=5

x-y=a

2x = (5+a)

x = (5+a) / 2 = 5/2 + a/2

x=5/2 + a/2

x-y=a

y = x - a, x=5/2 + a/2

y = 5/2 + a/2-a

y = 5/2 - a/2