Answer:
2. y = 2x
Explanation:
To find the slope of a line given two points, simply use:
rise/run
From one point to another, count how many units you have to go horizontally and vertically. Count from left to right. If the second point is down, then it is a negative slope. If the second point is up, then it is a positive slope.
In this example, the first point is at the origin, or (0,0). The second point is at (2,4). To get from the first point to the second point, you have to go up 4 units and right 2 units.
Now if we put that in rise/run, we get:
4/2
Which is also equal to 2.
So the answer is the second choice: 2. y=2x.