(1):
-x+2y =4
-x = 4-2y
x = 2y-4
(2):
7(2y-4)-3y = 5
14y-28-3y = 5
11y = 33
y = 3; x = 6-4 = 2
(2; 3)
(1):
-x+2y =4
-x = 4-2y
x = 2y-4
(2):
7(2y-4)-3y = 5
14y-28-3y = 5
11y = 33
y = 3; x = 6-4 = 2
(2; 3)