Question

me ajudem nessas equações de 1 grau -

a) 40 + 6y = -2y + 120

b) x + x + x = 30 + 30 +30

c) 2x - 12 + 6 = x + 30

d) 5x = 2000

e) -12x + 7x = -105 + 100

Answer 1

a) 40 + 6y = -2y + 120
6y + 2y = 120 - 40
8y = 80
y = 80 / 8
y = 10

b) x + x + x = 30 + 30 +30
3x = 90
x = 90 / 3
x = 30

c) 2x - 12 + 6 = x + 30
2x - x = 30 + 12 - 6
x = 30 + 6
x = 36

d) 5x = 2000
x = 2000 / 5
x = 400

e) -12x + 7x = -105 + 100
-5x = -5
x = -5 / -5
x = 1