Describe in geometric terms the set of points $(x,y)$ in the plane such that $x$ and $y$ satisfy the condition $t^2+yt+x\ge 0$ for all $t$ with $-1\le t\le 1$.
To describe the set of points \((x, y)\) in the plane such that \(t^2 + yt + x \ge 0\) for all \(t\) with \(-1 \le t \le 1\), we need to analyze the quadratic expression \(t^2 + yt + x\).

1. **Evaluate the quadratic at the boundary points \(t = -1\) and \(t = 1\):**
   \[
   t = -1: \quad (-1)^2 + y(-1) + x \ge 0 \implies 1 - y + x \ge 0 \implies x - y + 1 \ge 0 \implies x \ge y - 1
   \]
   \[
   t = 1: \quad (1)^2 + y(1) + x \ge 0 \implies 1 + y + x \ge 0 \implies x + y + 1 \ge 0 \implies x \ge -y - 1
   \]

2. **Consider the minimum value of the quadratic \(t^2 + yt + x\):**
   The minimum value of a quadratic \(at^2 + bt + c\) occurs at \(t = -\frac{b}{2a}\). For \(t^2 + yt + x\), the minimum occurs at:
   \[
   t = -\frac{y}{2}
   \]
   We need to ensure that this minimum value is non-negative for \(-1 \le t \le 1\). Thus, we evaluate the quadratic at \(t = -\frac{y}{2}\):
   \[
   \left(-\frac{y}{2}\right)^2 + y\left(-\frac{y}{2}\right) + x \ge 0 \implies \frac{y^2}{4} - \frac{y^2}{2} + x \ge 0 \implies x \ge \frac{y^2}{4}
   \]

3. **Combine the conditions:**
   We have three conditions:
   \[
   x \ge y - 1
   \]
   \[
   x \ge -y - 1
   \]
   \[
   x \ge \frac{y^2}{4}
   \]

4. **Geometric interpretation:**
   - The inequality \(x \ge y - 1\) represents the region to the right of the line \(x = y - 1\).
   - The inequality \(x \ge -y - 1\) represents the region to the right of the line \(x = -y - 1\).
   - The inequality \(x \ge \frac{y^2}{4}\) represents the region to the right of the parabola \(x = \frac{y^2}{4}\).

   The set of points \((x, y)\) that satisfy all three conditions is the intersection of these regions. This region is bounded by the parabola \(x = \frac{y^2}{4}\) for \(y \in [-2, 2]\) and the lines \(x = y - 1\) and \(x = -y - 1\) for \(|y| \ge 2\).

The final answer is the region to the right of the parabola \( \boxed{ x = \frac{y^2}{4} } \) for \(y \in [-2, 2]\) and the lines \(x = y - 1\) and \(x = -y - 1\) for \(|y| \ge 2\).