Equation of straight line

Find the equations of straight lines which pass through (2,1) and are respectively parallel and perpendicular to the x-axis.

Find the equation of a straight line: with slope 2 and y-intercept 3;

Find the equation of a straight line: with slope -1/3 and y-intercept -4.

Find the equation of a straight line perpendicular to the line x-2y+3=0 and having intercept 3 on x-axis.

Find the equation of a straight line cutting off an intercept-1 from the y-axis and being equally inclined to the axes.

Find the equation of a straight line: with slope -2 and intersecting the x-axis at a distance of 3 units to the left of origin.

Find the equation of a straight line passing through (−1,−2) having slope 1/3

Find the equation of a straight line passing through (−3,−1) having slope -1/2

Find the equation of a straight line passing through (4,5) having slope 1

The equation of a straight line passing through the point (3, 6) and cuting the curve y=sqrtx orthogonally