29.25 + 709-1)
what’s the answer to this question and can you show me how to do it because i don’t understand

What are “like terms”? why can we only add like terms?

Solve 2x+y=3 x+y=5 in substitution method

Plzz ! if you were constructing a triangular frame, and you had wood in the length of 4 inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking/show your work: