Question

Choose the ordered pair that is a solution of the system.

x + y = 4
x = –1

A.
(–1, 5)

B.
(5, –1)

C.
(–1, 3)

Answer 1

A. If you substitute x=-1 in x=-1,it become true. If you substitute x=-1 and y=5 it equals 4

Answer 2

A) (-1, 5) is the answer. We are already given x=-1 and to find y, just plug in -1 to the first equation for x to get y=5.