With yx = zx, then by the Multiplicative Property of Equality, y = z. Since z is a negative integer, then y is also a negative integer. Since yx is positive, with y equal to a negative integer, then x is negative.
The defenition of a rectangle is that it has 4 angles that measure 90 degrees ther are infinite legnths and inifinite numbers intinite side legnths so infinite number of unique rectangles
