Răspuns:
Explicație pas cu pas:
a) 3(x-2) - 4(x-1) = -7x
3x - 6 -4x + 4 = -7x
3x - 4x + 7x = 6 -4
6x = 2
x = 2/6 = 1/3
b) 6x + 1 >= 7(x-1)
6x + 1 >= 7x - 7
6x - 7x >= -1 - 7
-x >= -8
x <=8
c) 2x - 3y = -1
x + y = 2 => x = 2 - y
2(2-y) - 3y = -1 => 4 - 2y - 3y = -1 => 4 - 5y = -1 => -5y = -4-1 => -5y =-5=> y= 1
x = 2-1 = 1
d) 4x+2>=5x+3 => 4x -5x >= -2 + 3 => -x >= 1 => x<=-1
2-3x<7-2x => -3x + 2x < -2+7 => -x < 5 => x >-5
