Help me please i dont understand this

Firstly find two coordinates that lie on the line, we have (0,6) and (8,10).

Slope= (y2-y1)/(x2-x1)
= (10-6)/(8-0)
= 4/8
= 1/2

The answer is B

Find the perimeter of the figure shown above with a side length 5 units.(each figure is a square).a.10 unitsc.30 unitsb.20 unitsd.40 units select the best answer from the choices providedabcdmark this and return