Question

DETERMINE O PAR ORDENADO DE CADA SISTEMA
a: X+Y=20
X-Y=8

b: X-y = 5
X+y : 7

C: 4x-y =6
4y: 8

Answer 1

a: X+Y=20
X-Y=8
2x= 28
x= 28/2
x= 14
14+y=20
y= 20-14
y= 6
(14,6)

b: X-y = 5
X+y = 7
2x= 12
x= 12/2
x=6
6+y= 7
y= 7-6
y= 1
(6,1)
C: 4x-y =6
4y= 8
y= 8/4
y=2
4x-2=6
4x= 8
x= 8/4
x= 2
(2,2)
espero ter ajudado