Question

1-Determine x e y para que os pares ordenados sejam iguais:
a) (x, 3) = (-2, y)
b) (x+1, 3) = (2, y-1)
c) (3, 5x-3y) = (2x+y, 2)

Answer 1

a) (x, 3) = (-2, y)
x= -2
3= y
b) (x+1, 3) = (2, y-1)
x+1= 2
x= 1
3= y-1
y= 4

c) (3, 5x-3y) = (2x+y, 2)

2x+y= 3  (I)   (* 3)
5x-3y= 2 (II)

6x+ 3y= 9
+
5x -3y= 2
 
11x+ 0 = 11

x=1

2x+y= 3  (I)
2*1 +Y= 3
Y= 1