Chp 5 5.5 Dir Variation.notebook
December 01, 2011
5.5 Direct Variation
A function in the form y=kx is a Direct Variation
1. Write an equation of the direct variation that includes the point (4,­3) y=kx
replace y with ­3
replace x
with 4
­3=k(4) ­3=4k 4 4 k = ­3
4
Answer
­3
y= x
4
2. Write an equation of the direct variation that includes the point (8,­10)
Another way to do these
y coordinate ­10 ­5
y= x coordinate
= =
8
4
Answer
­5
y= x
4
3. Write an equation of the direct variation that includes the point (­3,­6)
y coordinate ­6 2
y= x coordinate
= ­3 =
Answer
y= x
2
Nov 20­8:03 AM
1
Chp 5 5.5 Dir Variation.notebook
December 01, 2011
Write an equation of the direct variation that includes the given point 1.
2.
3.
4.
5.
6.
7.
8.
9.
Which of these ordered pairs are solutions to the equation?
Nov 20­8:18 AM
2
Chp 5 5.5 Dir Variation.notebook
December 01, 2011
Write an equation of the direct variation that includes the given point 1.
2.
3.
4.
5.
6.
7.
8.
9.
Nov 20­8:18 AM
3
Chp 5 5.5 Dir Variation.notebook
December 01, 2011
X
Y
­3
4
0
2
3
0
For Miss Muffet worksheet:
Complete chart
Draw line and you will cross over letter
Go to puzzle at bottom of wksht and cross out every letter you cross out from above.
The letters left will be used in the answer box.
Nov 30­9:17 AM
4