Question

Resolva as equações: a)x+3=7 b)2x-5=x+4 c)9-4x-4=x+7-1 d)16x+5-3= -2x-15e)-x +40=4xf)6(x+5)=xg)5(y-9)-3= -18-yh)10-6(z-8)=9(n-7)-2i)12+2n=0(n-7)-2

Answer 1

A)x+3=7
x=7-3
x=4
B)2x-5=x+4
2x-x=4+5
x=9
C)9-4x-4=x+7-1
-4x-x=7-1-9+4
-5x=1
5x=1
x=1/5
D)16x+5-3=-2x-15
16x+2x=-15-5+3
18x=-17
x=-17/18
E)-x+40=4x
-x-4x=-40
-5x=-40
5x=40
x=40/5
x=8
F)6(x+5)=x
6x+30=x
6x-x=-30
5x=-30
x=-30/5
x=-6
G)5(y-9)-3=-18-y
5y-45-3=-18-y
5+y=-18+45+3
6y=30
y=30/6
y=5
H)10-6(z-8)=9(n-7)-2
10-6z+48=9n-63-2
-6z-9n=-63-2-10-48
-15zn=-123
15zn=123
zn=123/15
zn=41/5
I)12+2n=0(n-7)-2
12+2n=n-7-2
2n-n=-7-2-12
n=-21
Acho que é isso!