Algebra 2
Quiz 2.3-2.4
Name _____________________________________
1. Determine whether y varies directly with x. If so, find the constant of variation and write the equation.
x
7
9
-4
y
14
18
-8
2. Does y vary directly with x in each of the functions?
a. y = 3x + 7
b. 2y = -12x
3. A driver’s reaction distance varies directly with the speed of the car. If a driver is traveling 30 mi/hr, his reaction distance will be
33 ft. For what speed is the reaction distance of 50 ft?
4. Graph the data. Draw the trend line and write its equation. (If you do the work on the calculator, you must still graph the data
below and draw the trend line.)
(0, 7), (2, 6), (5, 4.5), (6, 4), (9, 2.5)
8
7
6
5
4
3
2
1
-1
1
2
3
4
5
6
7
8
9 10
-1
5.
A candle is 7 in. tall after burning for 1 hour, and 5 in. tall after burning 2 hours. Write a linear equation.