6. Решите систему уравнений: { x-6y = 20, 4x+2y = 2 }

From the first equation, x = 20 + 6y.
Substitute into the second equation: 4(20 + 6y) + 2y = 2
80 + 24y + 2y = 2
26y = -78
y = -3.
Substitute y = -3 into x = 20 + 6y: x = 20 + 6(-3) = 20 - 18 = 2.
Solution: x = 2, y = -3.