Answer:
Graph A.
Explanation:
You want the equation in slope-intercept form, y=mx+b. In x+y=7, you want the y by itself, so subtract x on both sides to get y=-x+7. After that, on the graph, go up 7 units on the y-axis, down 1 unit indicated by -x, and 1 to the right. Strikethrough both dots and you get Graph A.