Question

Rezolvati in Z ecuatiile
a) x+(-2)=-8 b) x-(-3)=-5 c) 2x-3=-1
d) 3x+1=-8 e) 5x-7=-3 f) -2x+3=8

Answer 1

a) x - 2 = -8
x = 2 - 8 = -6

b) x + 3 = -5
x = -3 - 5 = -8

c) 2x = 3 - 1
2x = 2
x = 1

d) 3x = - 1 - 8
3x = -9
x = -3

e) 5x = - 3 + 7
5x = 4
x = 4/5 ∉ Z ( poate era 5x + 7..)

f) - 2x = 8 - 3
-2x = 5
x = - 5/2 ∉ Z