you need tu express the given EC. in the way y=mx+b y-intercept (0,b) , slope m
so we got -y=x +4 multiply by -1 de EC
y=-x-4 comparing the EC. slope m=-1 y-intercept (0,-4)
x-intercept you put y=o and solve the ecuation for x
0=x+4 ⇒ x=-4 x-intercept (-4,0)