Find the x² Coefficient in y=3x+30: Linear vs Quadratic Analysis

The given equation is $y = 3x + 30$. This equation does not include a term involving $x^2$, meaning it is not a quadratic equation. A quadratic equation is typically of the form $ax^2 + bx + c = 0$ and includes an $x^2$ term.

Let's compare:

• The general form of a quadratic equation: $ax^2 + bx + c$
• Our equation: $y = 3x + 30$

By observation, the given equation does not have an $x^2$ term. Therefore, there can be no coefficient $a$ because it would need to be a coefficient of an $x^2$ component that does not exist in this equation.

Therefore, this is not a quadratic equation.

The correct choice is: "That's not a quadratic equation."