Question

resolva as equações:
a)5x-10=3
b)4y-5=2y+3
c)20-t+4=2t
d)7x+2=5x-8
e)6-3x=-30-9x
f)x-1=3x+5

Answer 1

a)
5x - 10 = 3
5x = 3 + 10
5x = 13
x = 13/5

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b)
4y - 5 = 2y + 3
4y - 2y = 3 + 5
2y = 8
y = 8/2
y = 4


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c)
20 - t + 4 = 2t
20 + 4 - t = 2t
24 = 2t + t
24 = 3t
3t = 24
t = 24/3
t = 8


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d)
7x + 2 = 5x - 8
7x - 5x = - 8 - 2
2x = - 10
x = -10/2
x = - 5

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e)
6 - 3x = - 30 - 9x
9x - 3x = - 30 - 6
6x = - 36
x = -36/6
x = - 6


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f)
x - 1 = 3x + 5
- 1 - 5 = 3x - x
- 6 = 2x
2x = - 6
x = - 6/2
x = - 3
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