Answer:
y=-1x+3
Explanation:
Slope intercept form: y=mx+b
x intercept (3,0)
y intercept (0,3)

start subbing in numbers from one of the points. I'm using hte x intercept so it would be (0,3). m = slope
y=mx+b
3=-1*0+b
3=0+b
b=3
so now that you know what b and the slope is,
y= -1x+3