Answer:
y = -x +3
Explanation:
Think about the Y= mx + b
m = -1 so it's -x
b = 3, so it's +3
y intercept goes after the slope:
Y= Mx + B
Y = -x + 3
If you have any more questions that are math related (algebra 1 and geometry, please let me know and don't forget to click that friend button! Let me know if you have any more questions!