y=mx+b is standard form.
b = y- intercept
m = slope
Using the information you’ve provided...
m = -2/3
This is because -2/3 is the slope.
b = 0
This is because the y-intercept is at the origin.
Using the information, fill in the standard form.
y=-2/3x +0 or y = -2x
I hope this helps!!
Feel free to ask any questions!