(45x + 64y) - (3x - 16y)
First, simplify to remove brackets. / Your problem should look like: [tex]45x + 64y - 3x + 16y[/tex]
Second, gather like terms. / Your problem should look like: [tex](45x - 3x) + (64y + 16y)[/tex]
Third, simplify. / Your problem should look like: [tex]42x + 80y[/tex]
Answer: C) 42x + 80y