Lesson 6: Practice Problems

Problem 1

Match the graph to the following situations (you can use a graph multiple times). For each match, name possible independent and dependent variables and how you would label the axes.

Graph B are unconnected line segments going down

Graph C starts near the top and curves down but is not smooth

Tyler pours the same amount of milk from a bottle every morning.
A plant grows the same amount every week.
The day started very warm but then it got colder.
A carnival has an entry fee of $5 and tickets for rides cost $1 each.

Problem 2

Jada fills her aquarium with water.

The graph shows the height of the water, in cm, in the aquarium as a function of time in minutes. Invent a story of how Jada fills the aquarium that fits the graph.

A graph of time (minutes) vs height (cm) with line segments starting at (0,0) and going up to (5,30) at different slopes with a flat segment then goes down and levels out

Problem 3 From Unit 6 Lesson 4

Recall the formula for area of a circle.

Write an equation relating a circle’s radius, $r$ , and area, $A$ .
Is area a function of the radius? Is radius a function of the area?
Fill in the missing parts of the table.
$r$
$3$
$\frac{1}{2}$
$A$
$16 π$
$100 π$

$r$	$3$		$\frac{1}{2}$
$A$		$16 π$		$100 π$

Problem 4

The points with coordinates $(4, 8)$ , $(2, 10)$ , and $(5, 7)$ all lie on the line $2 x + 2 y = 24$ .

Create a graph, plot the points, and sketch the line.
What is the slope of the line you graphed?
What does this slope tell you about the relationship between lengths and widths of rectangles with perimeter 24?