Equations given as only a constanty-value represent a horizontal line. Thus, the y-value will be 7 for all points on the line. Let's graph three arbitrary points with y-value 7.
We know now complete the graph with a line through the points.
Once again, there is no x in the equation which means that x can take all values and y will always be -32. Therefore, we should plot some points with the y-value -32. It's a bit tricky to locate -32 but it will be somewhere between 0 and -1 on the y-axis, closer to -1.
Now, the graph of y=-32 will pass through all points with y-value -32.