If (a, b) is at unit distance from the line 8x + 6y + 1 = 0, then which of the following conditions are correct?

I. 3a $$-$$ 4b $$-$$ 4 = 0

II. 8a + 6b + 11 = 0

III. 8a + 6b $$-$$ 9 = 0

Select the correct answer using the code given below

A straight line cuts off an intercept of 2 units on the positive direction of X-axis and passes through the point ($$-$$3, 5). What is the foot of the perpendicular drawn from the point (3, 3) on this line?

Consider a parallelogram whose vertices are A(1, 2), B(4, y), C(x, 6) and D(3, 5) taken in order.

What is the value of AC² $$-$$ BD² ?

Consider a parallelogram whose vertices are A(1, 2), B(4, y), C(x, 6) and D(3, 5) taken in order.

What is the point of intersection of the diagonals ?