Practice Page
Directions: These questions pretain to limiting the domains of linear equations to match conditions.

1.
At age 10, Zak puts $5 in a piggy bank and adds $5 every year there after. At age 40, he will break the piggy bank and spend his savings. The amount of money in the piggy bank can be modeled by the equation d = 5a - 45, where d is dollars in the piggy bank and a is Zak's age. Which constraint applies to the model of this story?
Cgraph3a
Choose:
 
cequation3a
cequation3b
cequations3c
cequations3d



2.
A child slides down a slide starting 12 feet above the ground. The child's path is modeled by the equation s = -0.75h + 12. where s is the height on the slide in feet and h is the horizontal distance on the slide in feet. The slide ends one and one-half feet above the ground. Which constraint applies to the model of the path down the slide?
cgraph4a
Choose:
 
cequation4a
cequation4b
cequation4c
cequation4d



3.
A cross country skier starts out on a 5 mile trail. The trail from mile 1 to mile 3 is a flat open field which is 2 feet above sea level. This portion of the trail can be modeled by the equation y = 2 where y = feet above sea level and x = miles traveled. Which constraint applies to the graph of this portion of the trail?
cgraph5a
Choose:
 
cequation5a
cequation5b
cequation5c
cequation5d



4.
The Ellen Brook School District closes school if the morning temperature is at, or below, -20º F. The superintendent follows the temperature starting at 2 am and makes the decision whether to close the school at 6 am. The early morning temperatures during one such cold spell followed the model y = x - 26. where y = the temperature (º F) and x = hours since midnight. Which constraint applies to the graph of this decision-making process?
cgraph6a
Choose:
 
cequation6a
cequation6b
cequation6c
cequation6d



 


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