If a

Can some one explain if this is correct in JavaScript? Or how to achieve that?

X - constant imput y - constant imput X>Y

If ay return value

Option 1: if (100=<x=<500 & 1=<y=<7) return 5;

Or

Option 2: if (100<=x & x=<5000 & 12<=y & y<17) return 5;