Question

Agora resolva estas. Veja o exemplo.
a)2x+5=13⇒x=\frac{13-5}{2}⇒x=4

b)4y+8=40=0
c)6t+2=26=12
d)3a+10=70=35
e)2x-20=4=6
f)7m-5=16
g)-2b+10
h)-4z+12=-
i)-5t-20=
j)-3z-10=-
Me ajudem por favor.

Answer 1

a)2 x + 5 = 13
2 x = 13 - 5
2 x = 8
 x = 8/2
x = 4
b)4 y + 8 = 40
4 y = 40 - 8
4 y = 32
y = 32/4
y = 8
c)6 t + 2 = 26
6 t = 26 - 2
6 t = 24
t = 24/6
t = 4
d)3 a + 10 = 70
3 a = 70 - 10
3 a = 60
a = 60/3
a = 20
e)2 x - 20 = 4
2 x = 4 + 20
2 x = 24
x = 24/2
x = 12
f)7 m - 5 = 16
7 m = 16 + 5
7 m = 21
m = 21/7
m = 3
g)-2 b + 10 = 
-2 b = - 10
b = -10/-2
b = 5
h)-4 z + 12 = 
-4 z = -12
x = -12/-4
z = 3
i)-5 t - 20 = 
-5 t = 20
t = 20/-5
t = - 4
j)-3 z - 10 
-3 z = 10
z = 10/-3
z = - 10/3