What is the value of $xy$?


(1) $y = x + 1$

(2) $y = x^2 + 1$

Wait, I thought combining them would give me a value? Setting the two equations equal gives x^2 = x, so x = 0 or 1. Two values means not sufficient, right?

pretty straightforward once you realize each statement alone gives you a relationship but not an actual number. classic trap to combine and forget there can be two solutions

thanks, helpful

this one felt easier than most DS algebra. just test if each statement pins down one value