Question

Question 1

Solve the system of equations and choose the correct answer from the list of options.
d + e = 15
−d + e = −5
Label the ordered pair as (d, e).
A (0, 0)
B (10, −5)
C (5, 10)
D (10, 5)

Answer 1

e=15-d
Sub the above equation into -d+e=-5
-d+15-d=-5
-2d=-20
d=10
e=5
Ans:D