Решите систему неравенств: a) {6x - 11 ≤ 4x - 3, 4 - 5x < 9; б) {4 - 1,3x ≥ 0,7x, x/6 < x + 2.

a) Решим систему неравенств:

{6x - 11 ≤ 4x - 3,

4 - 5x < 9;

{6x - 4x ≤ 11 - 3,

-5x < 9 - 4;

{2x ≤ 8,

-5x < 5;

{x ≤ 4,

x > -1;

-1 < x ≤ 4

б) Решим систему неравенств:

{4 - 1,3x ≥ 0,7x,

x/6 < x + 2;

{4 ≥ 0,7x + 1,3x,

x < 6x + 12;

{4 ≥ 2x,

x - 6x < 12;

{x ≤ 2,

-5x < 12;

{x ≤ 2,

x > -12/5;

{x ≤ 2,

x > -2 и 2/5;

-2 и 2/5 < x ≤ 2