URGENT! Complete the equation describing how ex and Y related! Help on the last part please!

Answer:
y = - 0.5x - 1
Step-by-step explanation:
The equation is of the form
y = mx + c ( m is the slope and c the y- intercept )
m = - 0.5 is already given as y = - 0.5x
Using the ordered pair (0, - 1 ) ⇒ c = - 1
Thus
y = - 0.5x - 1 ← is the equation