Question

If the slope of a curve is constant, then the graph of a curve in the plane is \(\ldots \ldots\) (a) line (b) parabola (c) hyperbola (d) none of these

Short answer

If the slope of a curve is constant, then the graph of a curve in the plane is a \(line\), as it is the only curve type with a constant slope.

Step-by-step solution

Identify the properties of various curve types

First, let's review the main properties of the given curve types: - A line has a constant slope throughout its length. - A parabola has a varying slope and is characterized by a quadratic function. - A hyperbola is represented by a reciprocal function. Its slope varies based on the position in the graph.

Determine the slope of each curve type

Now that we have reviewed the general properties of lines, parabolas, and hyperbolas, let's discuss their slopes more specifically: - For a line, the slope is constant and can be represented as \(m = \frac{Δy}{Δx}\) for any two points on the line. - For a parabola, the slope is not constant. It varies as we move along the curve. - For a hyperbola, the slope is also not constant and changes as we move along the curve.

Relate the constant slope to the given curve types

Since we are given a curve with a constant slope, we can compare its characteristics to the properties of the given curve types: - A line has a constant slope, which matches the given criteria for our curve. - A parabola has a varying slope, which does not match the given criteria for our curve. - A hyperbola has a varying slope, which does not match the given criteria for our curve. Therefore, the graph of the curve should be option (a) line since it is the only curve type that has a constant slope.

Key concepts

Linear Equations

When we talk about linear equations, we're discussing the backbone of algebra which often represents straight lines when graphed on a cartesian plane. These equations take the general form of \(y = mx + b\), where \(m\) represents the slope of the line, and \(b\) is the y-intercept, which tells us where the line crosses the y-axis.

The slope is a measure of how steep or flat the line is, and it remains constant for any two points on a straight line. This consistency of slope is a defining characteristic of lines, distinguishing them from other types of curves. To calculate the slope, we use the formula \(m = \frac{\Delta y}{\Delta x}\), where \(\Delta y\) is the change in y-values and \(\Delta x\) is the change in x-values between any two points on the line.

Understanding the behavior of linear equations is crucial as they serve as the simplest model for understanding relationships between variables in math, science, and various fields of study.

Quadratic Functions

Quadratic functions are a step up in complexity from linear equations and are most commonly represented as \(y = ax^2 + bx + c\), where \(a\), \(b\), and \(c\) are constants. These functions graph into a shape known as a parabola, which can either open upwards or downwards depending on the sign of the leading coefficient \(a\).

Unlike the straight lines described by linear equations, parabolas have a curved shape, with a varying slope at different points on the curve. The vertex of the parabola, where the curve changes direction, represents the maximum or minimum value of the function, depending on the parabola's orientation.

Quadratic functions are essential in understanding projectile motion, optimization problems, and they appear in various real-world applications like economics, engineering, and physics. Calculating the slope of a quadratic curve involves taking the derivative of the function, which is beyond basic algebra and crosses into calculus territory.

Hyperbola

The hyperbola is one of the conic sections, which is formed by the intersection of a plane and a cone. A hyperbola consists of two disconnected curves called branches, which mirror each other with respect to the center of the hyperbola. The standard form of a hyperbola equation is \(\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1\) for a horizontal orientation or \(\frac{y^2}{a^2} - \frac{x^2}{b^2} = 1\) for a vertical orientation, where \(a\) and \(b\) are real numbers that determine the shape of the hyperbola.

Similar to parabolas, hyperbolas have a varying slope along their curves. Due to their shape, they are often used in various fields such as astronomy, navigation, and physics. For example, hyperbolic paths characterize the possible trajectories of spacecrafts performing gravitational slingshot maneuvers around planets. Understanding hyperbolas helps in grasping the concept of asymptotes, as the branches of a hyperbola get infinitely closer to but never touch these straight lines.