Question

Resolva as equações do primeiro grau, a seguir:

a) 3x -5 = 25
b) 7x +10 = 5x
c) x/4 + 7 =12
d )5x/2 - 4 =-14
e) 6x - 5=4x + 10

Answer 1

a) 3x- 5= 25
—> 3x= 25+5
—> 3x= 30
—> x= 30/3= 10

b) 7x+10 = 5x
—> 7x-5x= 10
—> 2x= 10
—> x= 10/2 = 5

c) x/4+7= 12
—> x/4= 12-7
—> x/4= 5
—> x= 5x4= 20

d) 5x/2 - 4 = 20
—> 5x/2 = 20-4
—> 5x= 16x2
—> x= 32/5
—> x= 6,5

e) 6x - 5= 4x+10
—> 6x-4x= 10+5
—>2x= 15
—> x= 7,5