explain please the other is what type of conic section are the equation (parabola, circle, ellipse, hyperbola)

In f(x) = 3x, what do we call x? O Exponent O Dependent Variable O Outputx2 - 6y = 0 x2 ty - 2x - 3=0 25x2 + 4y2 - 100 = 0 4x2 - 16y2 - 64 = 0 2x2 + 9y2 + 16x - 90y + 239 = 0 x2 +y2 + 8x - 2y - 8=0 4x2 - 25y2 + 48x + 150y - 181 = 0 x2 - 10x + 4y + 37 = 0 x2 + 4y2 - 80y + 396 = 0 y2 - 4x - 6y + 13 = 0