Resolva as equações do primeiro grau.
a) 5(x − 2) = 4x + 6
b) −4(4 − x) = 2(x − 1)
c) −2x = −6
d) −3x + 1 = −8
e) 3(x − 5) = 2
f) 2(x + 1) = 2
g) −3(x + 2) = −6
h) 0, 1(x − 2) + 0, 5x = 0, 7
a) 5(x − 2) = 4x + 6
b) −4(4 − x) = 2(x − 1)
c) −2x = −6
d) −3x + 1 = −8
e) 3(x − 5) = 2
f) 2(x + 1) = 2
g) −3(x + 2) = −6
h) 0, 1(x − 2) + 0, 5x = 0, 7
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Resposta:
Explicação passo a passo:
1) + 5 = 8 da 1a. questão
2) − 4 = 3 até a 10a. questão
3) + 6 = 5 não é equação do
4) − 7 = −7 1o. grau
5) + 9 = −1
6) − 39 = −79
7)10 = + 8
8)15 = + 20
9)4 = – 10
10)7 = + 8
11) 9x = 6x + 12
9x -6x = 12
3x = 12
x = 12/3
x = 4
12) 5x – 1 = 3x + 11
5x -3x = 11 +1
2x = 12
x = 12/2
x = 6
13) 2x + 8 = x + 13
2x -x = 13 -8
x = 5
14) 9x – 2 = 4x + 18
9x -4x = 18 +2
5x = 20
x = 20/5
x = 4
15) 2x – 10 + 7x + 10 = 180
2x +7x = 180 +10 -10
9x = 180
x = 180/9
x = 20
16) 7y – 10 = y + 50
7y -y = 50 + 10
6y = 60
y = 60/6
y = 10
17) 4x – 18 + 3x = 10
4x +3x = 10 + 18
7x = 28
x = 28/7
x = 4
18) 2x + 5 + x + 7 = 18
2x +x = 18 -5 -7
3x = 18 -12
3x = 6
x = 6/3
x = 2
19) 5x – 91 = 4x – 77
5x -4x = -77 +91
x = 14
20) 7x + 1 = 5x – 7
7x -5x = -7 -1
2x = -8
x = -8/2
x = -4
21) 4x + 5 = x + 20
4x -x = 20 -5
3x = 15
x = 15/3
x = 5
22) 3(x + 1) + 2(2x – 3) = 5 (x – 1) + 8
3x +3 +4x -6 = 5x -5 +8
3x +4x -5x = -5 +8 -3 +6
7x -5x = +3 +3
2x = 6
x = 6/2
x = 3
23) 2(x + 5) – 4 = 26
2x +10 -4 = 26
2x = 26 -10 +4
2x = 20
x = 20/2
x = 10