ivan used 5 yards of green for each quilt and 4 yards of blue for each quilt.
when x = -9, y = 1
Here, we want to get the value of y when x = -9
To find this, we look at the point x= -9 on the x-axis
After getting this, we trace it to the graph
Looking at the graph, the graph crosses the x-axis at exactly this point
What this mean is that the value of y at that point is 1
Hence, for input -9, output is 1
