Question

Pares ordenados (x;4+y)=(1;2y-x)

Answer 1

x = 1
4 + y = 2y - x
4 + y = 2y - 1
4 + 1 = y
y = 5
Par ordenado : (x,y) = (1,5)

Answer 2

x = 1
4+y = 2y - x
4+y=2y-1
+y-2y=-1-4
-y = -5 (.-1)
y = 5
(1,5)