[size=150]Type in <= to get [math]\le[/math][/size] [size=150]and >= to get [math]\ge[/math][br][/size][size=150] [br]To solve 2x + 3 <= 4x - 3 AND x + 5 >= 3x - 5 , type in && for AND.[br][br] For x < 2x + 3 [math]\le[/math] x + 15 type in as x < 2x + 3 && 2x + 3 <= x + 15[br][br]This system does not solve for OR cases.[/size]