a) {X + Y: 6
{X – Y: 4
b) {2X + 4: 5
{X + 2Y: 4
c) {X + Y: 11
{X – Y: 3
d) {X – Y: 16 – 16
{X + y: 74 – 74
e) {X – Y: 1
{X + Y: 9
f) {2X – Y: 200
{2X + Y: 40
g) {X – Y: 1
{X + Y: 7
h) {X – Y: 3
{X + Y: -5
i) { X – Y: 5
{X + Y: 5
{X + 2Y: 4
{X – Y: 16 – 16
{X + y: 74 – 74???
{ x + y = 74 - 74
{x - y = 0
{x + y = 0
Respostas
pelo MÉTODO da ADIÇÃO
A)
{X + Y: 6
{X – Y: 4
x + y = 6
x - y = 4 SOMA
--------------------------
2x + 0 = 10
2x = 10
x = 10/2
x = 5 ( achar o valor de (y)) PEGAR um dos DOIS
x + y = 6
5 + y = 6
y = 6 - 5
y = 1
assim
x = 5
y = 1
b)
2X + 4: 5 ????????????????????
{X + 2Y: 4
c)
{X + Y: 11
{X – Y: 3
x + y = 11
x - y = 3 SOMA
----------------------------
2x + 0 = 14
2x = 14
x = 14/2
x = 7 ( achar o (y))
x + y = 11
7 + y = 11
y = 11 - 7
y = 4
assim
x = 7
y = 4
d)???????????????????????
{X – Y: 16 – 16
{X + y: 74 – 74
{x - y = 16 - 16
{ x + y = 74 - 74
{x - y = 0
{x + y = 0
x - y = 0
x + y = 0
-------------------------SOMA
0 + 0 = 0
e)
{X – Y: 1
{X + Y: 9
x - y = 1
x + y = 9 SOMA
--------------------------
2x + 0 = 10
2x = 10
x = 10/2
x = 5 ( achar o (y))
x + y = 9
5 + y = 9
y = 9 - 5
y = 4
assim
x = 5
y = 4
f)
{2X – Y: 200
{2X + Y: 40
2x - y = 200
2x + y = 40
--------------------------soma
4x + 0 = 240
4x = 240
x = 240/4
x = 60 ( achar o (y)
2x + y = 40
2(60) + y = 40
120 + y = 40
y = 40 - 120
y = - 80
assim
x = 60
y = - 80
g)
{X – Y: 1
{X + Y: 7
x - y = 1
x + y = 7 SOMA
------------------------
2x + 0 = 8
2x = 8
x = 82
x = 4 ( achar y)
x + y = 7
4 + y = 7
y = 7 - 4
y = 3
assim
x = 4
y = 3
h)
{X – Y: 3
{X + Y: -5
x - y = 3
x + y = 5 soma
--------------------------
2x + 0 = 8
2x = 8
x = 8/2
x = 4 ( achar y)
x + y = 5
4 + y = 5
y = 5 - 4
y = 1
assim
x = 4
y = 1
i)
{ X – Y: 5
{X + Y: 5
x - y = 5
x + y = 5
----------------------soma
2x + 0 = 10
2x = 10
x = 10/2
x = 5 ( achar y)
x + y = 5
5 + y = 5
y = 5 - 5
y = 0
assim
x = 5
y = 0