X + 3y = 1

-4x - 7y = - 14

one solution : (7, - 2)

Step-by-step explanation:

hello:

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

-4x - 7y = - 14 ... (**)

by (*) : x = 1-3y

put this value in (**) : - 4 (1-3y) - 7y = - 14

-4+12y-7y = - 14

5y=-10

y = - 2 but : x = 1-3y so : x = 1-3 (-2) = 7

one solution : (7, - 2)