10. Через точку А(6; 8) проведена прямая, параллельная оси абсцисс. Найдите ординату ее точки пересечения с осью Оу.

A line parallel to the x-axis has the equation y = c, where c is a constant.
Since the line passes through A(6, 8), the equation of the line is y = 8.
The y-axis has the equation x = 0. The intersection point is (0, 8). The y-coordinate is 8.