Y+y-3 is the expression need to find the triangle's area
The height of larger will be 3 cm
As,
= ∛8 cm³ * 27 cm³ / (2 cm) ³
= 3cm
A point doesn't have a slope. A line has. You need to find the slope of the line that these 2 points are on. The slope is
(the difference of the 'y' values) divided by (the difference of the 'x' values)
That appears to be zero. It's a horizontal line.