Answer:
y=-x+1
Step-by-step explanation:
to get this you use the point-slope formula
y-y1=m(x-x1) - plug in the coordinates and find the slope
y--3=-1(x-4) - change the sign and solve the parentheses
y+3=-x+4 - subtract 3 from both sides to get y by itself
y=-x+1
