Question

Resolva as equações:
a) x/3 = 7
b) x/4 = -3
c) 2x/5 = 4
d) 2x/3 = -10
e) 3x/4 = 30
f) 2x/5 = 18

Answer 1

a)
x/3 = 7
x = 3.7
x = 21

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b)
x/4 = -3
x = 4.(-3)
x = - 12

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)
2x/5 = 4
2x = 5.4
2x = 20
x = 20/2
x = 10

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
d)
2x/3 = -10
2x = 3.(-10)
2x = - 30
x = - 30/2
x = - 15

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
e)
3x/4 = 30
3x = 4.30
3x = 120
x = 120/3
x = 40


¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
f)
2x/5 = 18
2x = 5.18
2x = 90
x = 90/2
x = 45

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨

Answer 2

a) x/3 = 7
x = 3.7
x = 21

b) x/4 = - 3
x = 4.(- 3)
x = - 12

c) 2x/5 = 4
2x = 5.4
2x = 20
x = 20/2
x = 10

d) 2x/3 = - 10
2x = 3.(- 10)
2x = - 30
x = - 30/2
x = - 15

e) 3x/4 = 30
3x = 4.30
3x = 120
x = 120/3
x = 40

f) 2x/5 = 18
2x = 5.18
2x = 90
x = 90/2
x = 45