If [math]x + y = 2[/math] and [math] x^2 + y^2 = 2[/math], what is the value of [math]xy[/math]?
If y = x + 9 and 2× + 2y = 30, what is the value of x and y?
אם [math]x + y = 2[/math] ו-[math] x^2 + y^2 = 2[/math], מה הערך של [math]xy[/math]?
אם y = x + 9 ו-2× + 2y = 30, מה הערך של x ו-y?