Question

qual o resultado das seguintes equacoes a) 7y+5-y+8=31 b) 5. (3-2a) =55 c) 27= 3. (x+3) d) 16x+2. (7x+8)-9=67 e) 6. (4z+2) +7. (-5z+3) =66 f) 12+ (3x+6). (-7)-5=70

Answer 1

A) 7y +5 -y+8 =31
7y-y= 31-5-8
6y= 18
Y= 18/6
Y= 3

B) 5. ( 3-2a) =55
15 - 10a = 55
10a = 55-15
10a = 40
A= 40/10
A= 4

C)27 = 3. ( x+3)
27= 3x + 9
-3x = 9 - 27
-3x =- 18 . (-1)
3x = 18
X= 18/3
X= 6

D)16x+2. (7x+8)-9= 67
16x + 14x + 16 - 9 = 67
16x+ 14x = 67+9-16
30x = 60
X= 60/30
X= 2


E) 6. (4z+2)+7. (-5z+3)=66
24z+12-35z+21=66
24z-35z=66-21-12
-11z=33
11z=-33
z=-33/11
z=-3

F) 12+(3x+6). (-7)-5=70
12-21x-42-5=70
-21x=70-12+42+5
-21x=105
x=5