It tells you if the data raised alot or little.(Ex:if the first point is x95:y5 and the second is x95:y90 it is a steep slope.)
Those aren't math equations. An equation always has an equal sign, between two expressions.Additional Information:-If you meant: 2x+5y = 120 and x+y = 90Then by a process of elimination: x = 110 and y = -20