Question

how to graph x+4y=16

Answer 1

solve for y
4y=16-x
y=-(1/4)x+4
This is your standard y=mx+b form
x-intercept is at x=4
the slope is (-1/4) (the graph does downward)

Answer 2

a very easy procedure is to fine intercepts

for x-intercept put y=0 and solve for x
similarly for y-intercept

u got two points
(a,0) and (0,b)

u r done

put that on graph and join them