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Try the applet!
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Sample submitted
solution:
From: Lindsay
and Alison
School: Issaquah Middle School, Issaquah,
Washington
1. Explain the meaning of the red line,
the purple line, and the horizontal and
vertical axes on the graph.
The red line is the distance she travels.
The vertical axes measures the miles she
must travel to go home. The horizontal axes
measures the time she takes to get home.
The purple line is the rate she rides her
bike.
2. Suppose that Sally's home is either
3, 7, or 10 miles from school. Move the
slider and read the graph to find out how
long it takes her to get home in each case.
How do you know?
3 miles- The red and purple line intersect
at 18 minutes so thats how long it takes
her to get home. 7 miles- The red and purple
line intersect at 43 minutes so thats how
long it takes her to get home. 10 miles-
The red and purple line intersect at 60
minutes so thats how long it takes her to
get home.
3. (BONUS) Write an expression (a distance,
rate, time function) that allows Sally to
figure out how long it will take her to
ride her bike from school to any home location.
Explain how you came up with the expression.
d=r*t (distance=rate*time) The distance
is "d" because it is any given distance.
3=r*.3 7=r*.716 10=r*1 The rate is 10 miles
an hour because it takes her i hour to go
10 miles. The time is what we need to find
out so it is "y." The new expression is
y=d/10
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