If two lines of regression are x + 4y + 1 = 0 and 4x + 9y + 7 = 0, then what is the value of x when y = -3 ? 

A bivariate data set contains only two points (-1, 1) and (3, 2). What will be the line of regression of y on x ?

Consider the following statements in respect of the line passing through origin and inclining at an angle of 75° with the positive direction of x-axis :

1. The line passes through the point $\left(1, \frac{1}{2−\sqrt{3}}\right)$.

2. The line entirely lies in first and third quadrants.

Which of the statements given above is/are correct ?

If P(3, 4) is the mid-point of a line segment between the axes, then what is the equation of the line?