The expression "y<6" is called an inequality. You know that if it were to say "y=6", then y is exactly 6 and nothing else. "y<6" is similar, but instead means that y is less than 6. It's not giving you a specific value for y; instead, it's simply saying that y could be anything less than 6. It could be 3, it could be -1982347, it could be 1.23456789012345678901234567890 repeating six thousand times; anything just as long as it's under six. It could even be 5.9999999999999999999999999999999 -- even that is less than six (if only by 0.0000000000000000000000000000001). You can't simplify it any more than it is.
The expression "y<6" is called an inequality. You know that if it were to say "y=6", then y is exactly 6 and nothing else. "y<6" is similar, but instead means that y is less than 6. It's not giving you a specific value for y; instead, it's simply saying that y could be anything less than 6. It could be 3, it could be -1982347, it could be 1.23456789012345678901234567890 repeating six thousand times; anything just as long as it's under six. It could even be 5.9999999999999999999999999999999 -- even that is less than six (if only by 0.0000000000000000000000000000001). You can't simplify it any more than it is.
