Answer:
slope = - 2, y- intercept = 0
Explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
y = - 2x , that is
y = - 2x + 0 ← is in slope- intercept form
with slope m = - 2 and y- intercept c = 0 ( that is the origin )