A line has a length, but no width or height. A pentagon has a length and width but no height. A point doesn't really have any of them, maybe a bit of length. A cube has a length, width, and height, so our answer is C) Cube.
The slopes will be the same but the y-intercept will be different. I graphed out which equation will pass through (4,10) and also be parallel to y=1/2x-8.