2. Calcule o valor de x.
a) 5x + 5 = 20
b) 2x + 3 = 13
c) 10x + 10 = 40
d) 2x - 3 = 17
a) 5x + 5 = 20
b) 2x + 3 = 13
c) 10x + 10 = 40
d) 2x - 3 = 17
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Explicação passo-a-passo:
a) 5x = 20 - 5
5x = 15
x = 15/5
x= 3
b) 2x = 13 -3
2x = 10
x = 10/2
x= 5
c)10x = 40 - 10
10x = 30
x = 30/10
x= 3
d) 2x = 17 +3
2x = 20
x = 20/2
x= 10