Mankiii Mankiii

11-10-2015
Mathematics

contestada

solve :
20-9x=11
4(2x+1)=8
5(2x+5)=-15
3(8x+1)=-21

Respuesta :

11-10-2015

20-9x=11
-9x=11-20
-9x= -9
x= -9/(-9)
x=1

4(2x+1)=8
2x+1=8/4
2x+1=2
2x=2-1
2x=1
x=1/2
x=0.5

5(2x+5)=-15
2x+5= -15/5
2x+5= -3
2x= -3-5
2x= -8
x= -8/2
x=-4

3(8x+1)=-21
8x+1= -21/3
8x+1= -7
8x= -7-1
8x =-8
x= -8/8
x= -1

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