Explanation:
the slope is the ratio (y coordinate change / x coordinate change) when going from one point on the line to another.
we see
x changes by +16 (from -6 to 10). as per 10 - -6 = 16.
y changes by 4 - w.
the slope is 1/8.
1/8 = (4 - w)/16 | multiply both sides by 16
2 = 4 - w
w = 4 - 2 = 2
so, the point is (-6, 2).