Answer:
k = -3x
Explanation:
To find the slope, use rise over run
I started from (0, 0)
To get to the next whole number point, you must go up (rise) 3 and go back (run) 1
Since we are going back, the slope is negative.
The rise over run is -3/1 which simplifies to -3
To find y-intercept, we look at the point when x = 0. When x = 0, y = 0 so the y-intercept is 0 (which means you don't have to include it into the equation
y = -3x or k if that's what you use