any line with a slope of 0 is a flat line
which means it is in the form: y=b
so if you look at the slope intercept form of a line equation
you should recive this y=m*x+b , m=slope
so If m=0 then y=0*x+b=b
it will include all the points which have y=b
In your case, since it must include the point (5,4) and its y component is 4, The line with 0 slope containing this point must be y=4
Y=4 is your awnser Hope this helps mark me as brainliest please (:!
