Test Study Guide Key: Sci Not, DV, IV, and Lines and Curves of Best Fit
1.
2.
3.
4.
5.
6.
7.
1.97x10-1
1.68x10-10
y=4.54x+27.31 ; 86
y=-71.48x2+264472.33x-244624846.3 ; 6895
D
H
Direct Variation
Equation: y=ax
Constant of Variation: a=y/x
The graph of a direct variation always goes through the origin.
1. y=3x
2. y=1/8x
3. y=1/3x
4. Direct Variation. a=2
5. Not Direct Variation
6. Direct Variation. a=3
10. Not DV
11. DV; a=-2
12. not DV
13. y=.2x ; x=20 secs
14. y=20x; y=300 calories
Inverse Variation
Equation: y=k/x Constant of Variation:k=xy
4. y=12/x
5. n=8/m
6. r=27/k
7. Not IV
8. IV; k=-2
9. IV; k=20
10. y=72/x; y=18 hours
11. y=180/x; y=$22.50
12. y=-2x; y=12
13. y=320/x; x=32
14. y=-40/x; y=-8
15. m=3.5n; n=6