Question

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

Answer 1

Hello :
{x+y=4....(1)
{x−y=−6....(2)
(1)+(2) : x+x+y-y = 4+(-6)
2x = -2 
x= -2/2 = -1
subsct in (1) : -1  +y = 4
y = 5 
the solution is : (−1, 5)