Question

Urgente !!!!!! ....... As coordenadas (x,y) que satisfazem as equaçoes : x + 3y = 1 e -2x + 3y = 12

Answer 1

x + 3y = 1
-2x + 3y = 12
x = -3y + 1

-2.(-3y + 1) +3y = 12
+6y -2 +3y = 12
9y = 14
y = 14/9 

x + 3y = 1
x + 3.14/9 = 1
x +42/9 = 1
x + 14/3 = 1
x = -14/3 +1/1
x = -14/3 + 3/3
x = -11/3