The find the surface you do:
2(lw + lh + wh)
2((16*4) + (16*8) + (4*8)
2(64 + 128 + 32)
2(224)
The answer is 448

Start off by finding the slope of the line with the formula
.
Substitute the values. 
Subtract. 
Simplify. 
is the slope of the line.
Now, use the point-slope formula to create an equation, where
is the slope and
is a known point on the line. 
Substitute the values. 
Simplify. 
Move the
to create the final equation in slope-intercept form. 
Answer:
your answer is D. 6/8 hope this helps you