Which choice shows x + y = 3 in slope-intercept form and the correct graph of the equation?

To be able to graph a y=mx+b, it need to be in y=mx+b. So to answer your question you do the following.

x+y=3

You subtract the x to both side so it looks like this:

x+y=3

-x -x

Final answer is:

y=-x+3

we can't see all full 4 options, but if this is the full option, than the very left one is correct:

-2/5 * -3 3/4

remake the question, adding a picture of all the question, or write down the full left and right answers.