Question

1) Which ordered pair is the solution to the system of equations?

{x+y=−13x−y=21

(5.5, −6.5)
(10, −11)
(5, −6)
(7, −8)

Answer 1

The ordered pair that is the solution to the system of equations cane be solve by adding the two term

(x+ y=−13)+ (x−y=21) = (2x = 8)

X = 4

Substitute x to the first equation

4 +y = -13

Y = -17