Understanding Tangent Line Slopes

The video tutorial explains how to determine the sign of the slope of tangent lines at specific points on a graph. It begins by introducing tangent lines as linear approximations that touch the graph at a point without crossing it. The tutorial then sketches tangent lines at points A, B, and C, analyzing the slope at each point. At point A, the slope is negative as the line goes downhill. At point B, the slope is positive as the line goes uphill. At point C, the slope is zero because the line is horizontal. The video concludes by summarizing these findings.

What is the main task described in the video?

• To calculate the exact value of the slope

• To determine the sign of the slope of tangent lines

• To find the intersection points of the graph

• To draw the entire graph

How is a tangent line defined in the video?

• A line that is perpendicular to the graph

• A line that touches the graph at a point without crossing it

• A line that is parallel to the graph

• A line that crosses the graph at multiple points

What does a tangent line represent at a given point?

• A quadratic approximation of the function

• A linear approximation of the function

• A constant approximation of the function

• A cubic approximation of the function

What is the sign of the slope of the tangent line at Point A?

• Undefined

• Zero

• Negative

• Positive

How does the tangent line at Point A move from left to right?

• Uphill

• Downhill

• Horizontally

• Vertically

What is the sign of the slope of the tangent line at Point B?

• Positive

• Undefined

• Negative

• Zero

What is the slope of the tangent line at Point C?

• Zero

• Negative

• Positive

• Undefined

How does the graph behave at Point C?

• It goes downhill

• It fluctuates

• It stays constant

• It goes uphill