Graphing Quadratic Equations and Y-Intercepts

The video tutorial explains how Whitney graphs a quadratic equation, focusing on finding the y-intercept. It describes the process of identifying the y-intercept by substituting x with zero in the equation. The tutorial provides a step-by-step calculation, resulting in the y-intercept point of (0, 1).

What is the first step Whitney has completed in graphing the quadratic equation?

• Plotting the graph

• Solving for x

• Finding the vertex

• Finding the y-intercept

Where does the y-intercept occur on a graph?

• At the vertex

• Where the graph touches the x-axis

• Where the graph touches the y-axis

• At the origin

What value of x is used to find the y-intercept?

• 0

• -1

• 1

• 2

What is the y-intercept of the equation y = -x^2 + 2x + 1?

• (1, 0)

• (0, 0)

• (1, 1)

• (0, 1)

What is the result of substituting x = 0 into the equation y = -x^2 + 2x + 1?

• y = 0

• y = 2

• y = -1

• y = 1