The y-intercept (initial value) is 10 and it has a slope of -1, so this is the first graph.
I started at (-2, 0) but you can start at any point on the graph that goes through the corner of the square (if that makes sense) like a point on the graph. From one point to the next, you go down one and one to the right, therefore the slope is a -1
-3x-6=-4x-9
x - 6 = -9
x = -3
y = -3(-3)-6= 9 - 6 = 3
