A solution of a system of linear equations

x - y = 5

- 3 x + y = - 1

one solution : (-2; - 7)

Step-by-step explanation:

hello:

x - y = 5 ... (*)

- 3 x + y = - 1 ... (**)

by (*) : y=x-5

by (**) : y = 3x-1

3x-1 = x - 5

3x-x=-5+1

2x = - 4

x = - 2

but : y = x-5 so : y = - 2-5=-7

one solution : (-2; - 7)