Question

Resolva as equações (por favor a conta inteira) q)2.(x-1)+2.(3-x)=0 r)7.(x-1)= 2.(3x+1) s)2.(3 -y) + 7.(2-y) = 15 - 4y

Answer 1

Q
2.( x - 1 ) + 2.(3 - x ) = 0
2x - 2 + 6 - 2x = 0
0x = -4

IMPOSSÍVEL

R
7.( x - 1 ) = 2.(3x + 1 )
7x - 7 = 6x + 2
7x - 6x = 2 + 7
x = 9

S
2.( 3 - y ) + 7.( 2 - y ) = 15 - 4y
6 - 2y + 14 - 7y = 15 - 4y
-2y - 7y + 4y = 15 - 6 - 14
-5y = -5
5y = 5
y = 5/5
y = 1