Let x and y be non-zero, rational numbers, and let z be an irrational number. In the first column of the table below is an expression. In the second column, determine whether the value of each expression is rational or irrational.
Expression Rational/Irrational
x-y:
3z:
-2x:
y+z
Expression Rational/Irrational
x-y: Rational
3z: Irrational
-2x: Rational
y+z Irrational