class Coordenada:
    def __init__(self, a, b):
        self.x = a
        self.y = b

    def imprimir(self):
        print("x:", self.x, ", y:", self.y)

def soma(a, b):
    somax = a.x + b.x
    somay = a.y + b.y
    c = Coordenada(somax, somay)
    return c

def diferenca(a, b):
    return Coordenada(a.x - b.x, a.y - b.y)

def multiplacacao(ponto, escalar):
    return Coordenada(ponto.x * escalar, ponto.y * escalar)

p1 = Coordenada(1, 2)
p2 = Coordenada(3, 4)
p1.imprimir()
p3 = soma(p1, p2)
p4 = diferenca(p1, p2)
multiplacacao(p4, 5).imprimir()