5.6 Direct Variation2 Answers.notebook
January 29, 2015
5.6 Direct Variation
Key Ideas­ Two quantities x and y show _______ __________ when y = kx, where k is a number and k = 0.
The number k is called the __________ ___ __________________. 1
5.6 Direct Variation2 Answers.notebook
January 29, 2015
Graph of y = kx
­ Line passes through the origin
­ Slope is k
1) Plot the points. Draw a line through the points
x
1
2
3
4
y
­2 0
2
4
The line ______ pass through the origin. So, x and y _____ show direct variation.
2
5.6 Direct Variation2 Answers.notebook
January 29, 2015
2) Plot the points. Draw a line through the points
x
0
2
4
6
y
0
2
4
6
The line _____ pass through the origin. So, x and y ____ direct variation.
Tell whether x and y show direct variation
*Solve for y
3) y + 1 = 2x
The equation _____ be written as y = kx. So, x and y ____ show direct variation.
4) 1 y = x 2
The equation _____ be written as y = kx. So, x and y ____ show direct variation.
3
5.6 Direct Variation2 Answers.notebook
January 29, 2015
ON YOUR OWN: Do these graphs show direct variation?
Yes
Yes
No
No
Yes
Yes
No
No
OYO: Plot the points. Draw a line through the points
x
0
1
2
3
y
­2 1
4
7
The line ______ pass through the origin. So, x and y _____ show direct variation.
4