1. It seems you want to see the visual of a "through." 2. Assuming you meant the graph of a function looking like a "trough," this corresponds to a quadratic function or a parabola opening upwards. 3. The simplest quadratic function showing a trough is $y = x^2$. 4. This function has its vertex (lowest point) at the origin $(0, 0)$, creating a visual trough shape. 5. The graph opens upwards, so it dips down to the vertex and then rises on both sides. 6. This matches the idea of a trough as the low point in the curve. Final answer: The function $y = x^2$ represents a trough-shaped curve.