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Ocults1
@Ocults1
December 2019
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Resolva os seguintes sistemas de equações do 1° grau com 2 incógnitas.
a) x+y=50
2x+4y=100
b) x+y=32
2x+5y=150
c) x+y=32
10x+50y=980
d) x-y=32
10x+50y=980
Boa noite, alguém poderia me ajudar respondendo as questões que souberem? Obrigada. :)
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Elisa98Santos
Boa noite.
a) x ⁺ y ≈ 50
x ≈ 15
15
⁺ y ≈ 50
y ≈ 50-15
y≈ 35
(15,35)
2x ⁺ 4y ≈ 100
2×6 ⁺ 4y ≈ 100
12 ⁺ 4y ≈ 100
4y ≈ 100-12
4y ≈ 88
y ≈ 88/4
y ≈ 22
(6,22)
b) x ⁺ y ≈ 32
5 ⁺ y ≈ 32
y ≈ 32-5
y ≈ 27
(5,27)
2x ⁺ 5y ≈ 150
2×10 ⁺ 5y ≈ 150
20 ⁺ 5y ≈ 150
5y ≈ 150-20
5y ≈ 130
y≈ 130/5
y≈ 26
(10,26)
c) x ⁺ y ≈ 32
4 ⁺ y ≈ 32
y ≈ 32-4
y ≈ 28
(4,28)
10x ⁺ 50y ≈ 980
10×8 ⁺ 50y ≈ 980
80 ⁺ 50y ≈ 980
50y ≈ 980-80
50y ≈ 900
y ≈ 900/50
y ≈ 18
(8,18)
d) x-y≈32
x-7≈32
x≈ 32⁺7
x≈39
(39, -7)
10x⁺50y≈980
10x ⁺ 50×3≈980
10x ⁺ 150≈980
10x≈ 980-150
1ox≈ 830
x ≈ 830/10
x≈ 83
(83, 3)
Espero ter ajudado, bj.
0 votes
Thanks 0
Ocults1
Muito obrigada minha flor, beijo!
Elisa98Santos
por nada.
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Lista de comentários
a) x ⁺ y ≈ 50
x ≈ 15
15 ⁺ y ≈ 50
y ≈ 50-15
y≈ 35
(15,35)
2x ⁺ 4y ≈ 100
2×6 ⁺ 4y ≈ 100
12 ⁺ 4y ≈ 100
4y ≈ 100-12
4y ≈ 88
y ≈ 88/4
y ≈ 22
(6,22)
b) x ⁺ y ≈ 32
5 ⁺ y ≈ 32
y ≈ 32-5
y ≈ 27
(5,27)
2x ⁺ 5y ≈ 150
2×10 ⁺ 5y ≈ 150
20 ⁺ 5y ≈ 150
5y ≈ 150-20
5y ≈ 130
y≈ 130/5
y≈ 26
(10,26)
c) x ⁺ y ≈ 32
4 ⁺ y ≈ 32
y ≈ 32-4
y ≈ 28
(4,28)
10x ⁺ 50y ≈ 980
10×8 ⁺ 50y ≈ 980
80 ⁺ 50y ≈ 980
50y ≈ 980-80
50y ≈ 900
y ≈ 900/50
y ≈ 18
(8,18)
d) x-y≈32
x-7≈32
x≈ 32⁺7
x≈39
(39, -7)
10x⁺50y≈980
10x ⁺ 50×3≈980
10x ⁺ 150≈980
10x≈ 980-150
1ox≈ 830
x ≈ 830/10
x≈ 83
(83, 3)
Espero ter ajudado, bj.