✓ Got It?
The graph of a direct variation equation y = kx is a line with the following properties.
You can rewrite a direct variation equation y = kx as
For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation.
x | y |
---|---|
4 | 6 |
8 | 12 |
10 | 15 |
Find
The ratio
x | y |
---|---|
|
3.2 |
1 | 2.4 |
4 | 1.6 |
Find
The ratio
How can you check your answer?
Graph the ordered pairs in the coordinate plane. If you can connect them with a line that passes through (0, 0), then y varies directly with x.
✓ Got It?
For the data in the table below, does y vary directly with x? If it does, write an equation for the direct variation.
x | y |
---|---|
|
2.25 |
1 |
|
4 |
|