а) $$y = x + 4$$ и $$y = 2x$$
$$x + 4 = 2x$$
$$x = 4$$
$$y = 2 \cdot 4 = 8$$
Ответ: (4; 8)
б) $$y = -2x + 3$$ и $$y = 2x - 5$$
$$-2x + 3 = 2x - 5$$
$$4x = 8$$
$$x = 2$$
$$y = -2 \cdot 2 + 3 = -1$$
Ответ: (2; -1)
в) $$y = -x$$ и $$y = 3x - 4$$
$$-x = 3x - 4$$
$$4x = 4$$
$$x = 1$$
$$y = -1$$
Ответ: (1; -1)
г) $$y = 3x + 2$$ и $$y = -0.5x - 5$$
$$3x + 2 = -0.5x - 5$$
$$3.5x = -7$$
$$x = -2$$
$$y = 3 \cdot (-2) + 2 = -4$$
Ответ: (-2; -4)