Question

Qual o valor das seguintes equações? :
a) 10+a-2=5-1.(a+4)
b) 2b+5-b=3-3b+6
c) 2.(y-2)+3.(2y+2)=-5.(2-y)
d) x+3.(x-1)-2-3.(x-3)=0

Answer 1

a) 10 +a -2 = 5 -1.(a+4)

10 +a -2 = 5 -a -4

a+a = 5 -4 -10 +2

2a = -7

a = -7/2

a = -3,5

b) 2b +5 -b = 3 -3b +6

2b +3b -b = 6 +3 -5

4b = 4

b = 4/4

b = 1

c) 2.(y -2) +3. (2y+2) = -5. (2-y)

2y -4 +6y +6 = -10 +5y

2y +6y -5y = -10 -6 +4

3y = -12

y = -12/3
y = -4

d) x+3.(x-1) -2 -3.(x-3) = 0

x +3x -3 -2 -3x +9 = 0

3x -3x +x = -9 +2 +3

x = -4