Can somebody me what will the equation be for this line?

Well its pretty simple you just have to find the slope and then put it in slope intercept form

The slop if rise/over. Between the two points, you see from (0,0), it goes up 3, and then moves to the left 6 times. But since it moves to the left, you make it negative. Since the y intercept (where the graph touches the y) is 0, there would not be any number, which means your answer would be:

y=3x/6
y=x/2