Question

4x-2=-18



5x-2=7+6



2x+x=8,4


10x+1= -4-5

Answer 1

4x-2=-18

4x = - 18 + 2

4x = - 16

x =  - 16/4

x = - 4

S:{ - 4 }


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5x-2=7+6

5x = 7 + 6 + 2

5x = 15

x = 15/5

x = 3


S:{ 3 }

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2x+x=8,4

3x = 8,4

x = 8,4/3

x= 2,8


S:{ 2,8 }

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10x+1= - 4 - 5

10x = - 4 - 5 - 1

10x = - 10

x = - 10/10

x = - 1


S:{ - 1 }

Answer 2

4x-3=-18
4x=18+3
x=21/4
x=7

5x-2=7+6
5x=7+6+2
x=15/5
x=3


2x+x=8,4
2x°=8,4
x°=16,8
x=√16,8
x=+-4,09...
° significa ao quadrado

10x+1=-4-5
10x=-4-5-1
10x=-10
x=10/-10
x=-1