Answer:
D. The expression 5 y plus 2 y is equivalent to 15 y minus 8 y.
Step-by-step explanation:
first we unite like terms from the given problem, 15y - 8y which gives 7y
next we compare that answer to the two options, so 5y + 2y is 7y
BUT 9y - 3y is actually equal to 6y
so based on the A, B, C, D choices, D is the only one that says a correct statement
remember that like terms are numbers that have the same letters, all of them, so for example:
like terms:
5x, 11x
3ab, 18ab
and other numbers that have the same letters (can't remember the actual name right now)
non like terms:
6y, 3a
3y, 16xy
so if the letters don't match, they're not like terms
