Question

Solve the system of equations and choose the correct answer from the list of options.

d + e = 12
–d + e = –8

Label the ordered pair as (d, e).



A. (0, 0)
B.(2, 10)
C. (10, 2)
D. (12, 0)

Answer 1

Since you have d and -d, use the addition method.

Answer 2

That will give the value of e easily.
Then choose the only choice that has the correct value of e.

Answer 3

d + e =12
-d + e = -8
-----------
2e = 4
- -
2 2
----------
e = 2


d + e = 12
d + 2 = 12
- 2 -2
------------
d = 10

Answer 4

So, (10,2)