What is printed by the print statements in program P1, assuming…

What is printed by the print statements in program P1, assuming call-by-reference parameter passing?

Program P1()
{
x = 10;
y = 3;
func1(y, x, x);
print x;
print y;
}

func1(x, y, z)
{
y = y + 4;
z = x + y + z;
}