Identify the property that justifies "x=y; if y=9, then x=9"

The height of a triangle is 4 in. greater than twice its base. the area of the triangle is no more than 168 in.^2. which inequalitycan be used to find the possible lengths, x, of the base of the triangle?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Polygon hh is a scaled copy of polygon gg using a scale factor of 1/4. polygon h's area is what fraction of polygon g's area?