Question

how to find the slope intercept form of y+x=-3

Answer 1

y+x=-3 subtract x from both sides
y=-3-x do some switching
y=-x-3 yay, y=mx+b form :)

Answer 2

so the answer is (0,3) ?

Answer 3

well, your slope is -1 and your y intercept is -3,
if you check for x=0
y=-0-3
y=-3
so (0,-3) is on the line.
@ x=5
y=-5-3
y=-8
(5,-8) is on the line as well.

Answer 4

so i put (-1,-3) on the line ? sorry im so confused