1) resolva as equações do 1º grau:
a) x + 5 = 15
b) x + 3 = 7
c) x – 4 = – 12
d) 2x – 12 = 18 + x
e) 3x = 15
f) 4x = – 24
g) 9x = 9
h) 13x + 15 = 45 + 3x
i) 3x = – 21
j) 4x – 15 = 30 – x
k) 16 x –1 = 12x + 3
Soluções para a tarefa
Explicação passo-a-passo:
a)
x + 5 = 15
x = 15 - 5
x = 10
b)
x + 3 = 7
x = 7 - 3
x = 4
c)
x - 4 = -12
x = -12 + 4
x = -8
d)
2x – 12 = 18 + x
2x - x = 18 + 12
x = 30
e)
3x = 15
x = 15/3
x = 5
f)
4x = – 24
x = -24/4
x = -6
g)
9x = 9
x = 9/9
x = 1
h)
13x + 15 = 45 + 3x
13x - 3x = 45 - 15
10x = 30
x = 30/10
x = 3
i)
3x = – 21
x = -21/3
x = -7
j)
4x – 15 = 30 – x
4x + x = 30 + 15
5x = 45
x = 45/5
x = 9
k)
16x –1 = 12x + 3
16x - 12x = 3 + 1
4x = 4
x = 4/4
x = 1
Bom estudo.
a) x + 5 = 15
x = 15 - 5
x = 10
b) x + 3 = 7
x = 7 - 3
x = 4
c) x - 4 = -12
x = -12 + 4
x = -8
d) 2x - 12 = 18 + x
2 x - x = 18 + 12
x = 30
e) 3x = 15
x = 15/3
x = 5
f) 4x = -24
x = - 24/4
x = -6
g) 9x = 9
x = 9/9
x = 1
h) 13x + 15 = 45 + 3x
13x - 3x = 45 - 15
10x = 30
x = 30/10
x = 3
i) 3x = -21
x = - 21/3
x = -7
j) 4x - 15 = 30 - x
4x + x = 30 + 15
5x = 45
x = 45/5
x = 9
k) 16x - 1 = 12x + 3
16x - 12x = 3 + 1
4x = 4
x = 4/4
x = 1