Are the following like terms: $9y$9y and $10y$10y?
Yes
No
Are the following like terms: $9n^2$9n2 and $2n$2n?
Are the following like terms: $2xy$2xy and $4yx$4yx?
Are the following like terms: $10x^2y$10x2y and $9y^2x$9y2x?
Use letters to express generalised numbers and express basic arithmetic processes algebraically.