Question

Matemática 7º Ano!!!
Resolva as equações considerando U = Q
a)4.(x- 6) = - 3
b) 2. (3 - x) = - 4. (x - 1)
c) -1 . (x 4) = 3. (x 5)
d) 3. (1/3 - x) - ( -2x 7) = - 3

Answer 1

a)4x-24=-3
4x= 24-3
4x= 21
x = 21/4= 5,25

b)6-2x= -4x+4
-2x+4x=-6+4
2x= -2
x= -2/2=-1

c)-1x4=3x5
-1x4-3x5=0
- x4(1-3x)=0
x4=0
x'=0
1-3x=0
-3x=-1
x= 1/3

d)3/3-3x+2x7=-3
1-3x+2x7= -3
-3x+2x7+1+3=0
-3x+2x7+4=0
x(-3+2x6)+4=0
x=-4
2x6=3
x6=3/2
x= √sexta de 3/2