x + y = 12
x - y = 8
x + y = 12
x - y = 3
Soluções para a tarefa
Respondido por
3
X + y = 12
x - y = 8 >> x=8+y
(8+y) + y = 12
8+2y=12
2y=12-8
2y=4
y=4/2
y=2
x+y=12
x+2=12
x=12-2
x=10
-----------------------------------------
x + y = 12 >> x=12-y
x - y = 3
(12-y)-y=3
12-2y=3
-2y=3-12
-2y=-9 .(-1)
2y=9
y=4,5
x + y = 12
x+4,5=12
x=12-4,5
x=7,5
x - y = 8 >> x=8+y
(8+y) + y = 12
8+2y=12
2y=12-8
2y=4
y=4/2
y=2
x+y=12
x+2=12
x=12-2
x=10
-----------------------------------------
x + y = 12 >> x=12-y
x - y = 3
(12-y)-y=3
12-2y=3
-2y=3-12
-2y=-9 .(-1)
2y=9
y=4,5
x + y = 12
x+4,5=12
x=12-4,5
x=7,5
jplayhghkjggggg:
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Respondido por
1
Pelo método de adição:
a)
x + y = 12
x - y = 8
---------------
2x = 20
x = 20/2
x = 10
^^^^^^^^^^^^^^^^
x + y = 12
10 + y = 12
y = 12 - 10
y = 2
#########################
b)
x + y = 12
x - y = 3
--------------
2x = 15
x = 15/2
x = 7,5
^^^^^^^^^^^^^^^^
x + y = 12
7,5 + y = 12
y = 12 - 7,5
y = 4,5
a)
x + y = 12
x - y = 8
---------------
2x = 20
x = 20/2
x = 10
^^^^^^^^^^^^^^^^
x + y = 12
10 + y = 12
y = 12 - 10
y = 2
#########################
b)
x + y = 12
x - y = 3
--------------
2x = 15
x = 15/2
x = 7,5
^^^^^^^^^^^^^^^^
x + y = 12
7,5 + y = 12
y = 12 - 7,5
y = 4,5
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