Una piscina se llena a razón de 250L por hora. ¿Cuántos litros de agua tiene la piscina después de 7 horas?

Matt and brian were solving a system of equations. they both noticed that the two lines had the same slope. brian said that because each line in the system had the same slope, the two lines had to be parallel, which meant the solution to the system was "no solution" matt disagreed, and said they should also look at the y-intercepts before determining how many solutions there were. who is correct?

Plz which expression is equivalent to the expression below?

Pls! does anybody know a shortcut for answering these types of questions in the future?