Question

Resolve as seguintes equacoes:

a) 18x - 43 = 65
b) 10y - 5 (1 + y) = 3 (2y - 2) - 20
c) 4x - 5 = x + 2
d) 4 - 3 (z + 2) = 6
e) a/5 - 2a/3 = 7
f) x/2 - 2x-4/5 = 1
g) 2 (x/3 + 1/2) - 1/3 (x+2) = x

Answer 1

a) 18x-43=65
18x=65+43
x= 108

b) 10y-5(1+y)=3(2y-2)-20
10y-5-5y =6y-6-20
-5+6+20= -10y+6y+5y
-5 +26=11y-10y
21= 1y
y=21

c) 4x-5=x+2
4x-x=5+2
3x=7
x=7/3

d)4-3(z+2)=6
4-3z-6=6
-3z=6+6-4
-3z=12-4
-3z=8
z=8/-3

e)a/5-2a/3=7. MMC
3a/15-10a/15=105/ 15 5,3|3
3a-10a=105 5,1.|5
-7a=105 1,1. ----
a=105/7 15

f) x/2-2x-4/5=1
5x/10-20x/10-8/10=10/10. MMC
5x-20x=10+8. 5,2|2
-15x=18. 5,1.|5
x=18/15. 1,1. ----
12

g) 2(x/3+1/2)-1/3(x+2)=x
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essa nao consegui desculpa mais vê as outras