Question

Solve the following system.
x − y = 10
x + y = 8

A. (−9, 1)

B. (9, −1)

C. (9, 1)

D. (−1, 9)

Answer 1

Hint:

add the two equations to get

x − y = 10
x + y = 8
-----------
2x+0y = 18

so 2x = 18 ----> x = ??

once you've found x, use it to find y

Answer 2

is it (9,1)?

Answer 3

B. 9, -1

Answer 4

you found that x = 9, that much is correct

Answer 5

x + y = 8

9 + y = 8

....
....
....

y = ??

Answer 6

oh so it's (9,-1), then?

Answer 7

yes

Answer 8

alrighty, thank you!