In math x and y means unknown answer. The mystery numbers are always different like x doesn't mean 3 and y doesn't mean 0.
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x/y = 5/(y^2) and y/x = 5/(x^2). So x/y + y/x = 5/(y^2) + 5/(x^2), which equals 5x^2/(x^2 y^2) + 5y^2/(x^2 y^2) equals 5(x^2 + y^2)/25 equals (x^2 + y^2)/5. x^2 = 25/y^2, so you get (25/y^2 + y^4/y^2)/5 equals ((25 + y^4)/y^2)/25, which shows that your math teacher is on crack. Seriously, I'm not sure that's true.
x equals -12 and y equals 1/4 of -12, so y = -3.
Well, if 3x equals 12, then x equals 4. And if y equals 3x, then y equals 3 times 4, which is 12. So, y equals 12. Math can be a piece of cake when you break it down like that!
3
4(x)=12 2+x-y=3 x+y+z=15 4(x)-z+y=1 And in case you didn't figure it out, x is 3, y is 2 and z is 10