IM: 8.3.1: Understanding Proportional Relationships (Lesson)

Last updated 9 months ago
10 questions
1.1: Notice and Wonder: Two Graphs
1

What do you notice? What do you wonder?

1.2: Moving Through Representations
A ladybug and ant move at constant speeds. The diagrams with tick marks show their positions at different times. Each tick mark represents 1 centimeter.


1

Lines u and v also show the positions of the two bugs. Which line shows the ladybug’s movement? Which line shows the ant’s movement? Explain your reasoning.

1

How long does it take the ladybug to travel 12 cm? The ant?

1

Scale the vertical and horizontal axes by labeling each grid line with a number. You will need to use the time and distance information shown in the tick-mark diagrams.

1

Mark and label the point on line u and the point on line v that represent the time and position of each bug after traveling 1 cm.

Are you ready for more?
1

How fast is each bug traveling?

1

Will there ever be a time when the ant is twice as far away from the start as the ladybug? Explain your reasoning.

1.3: Moving Twice as Fast
Refer to the tick-mark diagrams and graph in the earlier activity when needed.


1

Imagine a bug that is moving twice as fast as the ladybug. On each tick-mark diagram, mark the position of this bug.

1

Plot this bug’s positions on the coordinate axes with lines u and v, and connect them with a line.

1

Write an equation for each of the three lines.