if the straight line joining the points `(3, 4)` and `(2, -1)` be parallel to the line joining the points `(a, -2)` and `(4, -a),`find the value of `a.`

The line joining the points (1,-5) and (4,-3) is parallel to the line joining the points .

The line joining the points (1,-5) and (4,-3) is parallel to the line joining the points .

The straight line joining the points (-3,-4) and(2,5) is -

If the straight line joining the points (2,1,4)and(a-1,4,-1) is parallel to the line joining the points (0,2,b-1)and(5,3,-2), find the values of a and b.

If the line joining the points (5,y) and (4,9) is parallel to the line joining the points (0,5) and (1,7) , find the value of y .

If the line joining the points (5,y) and (4,9) is parallel to the line joining the points (0,5) and (1,7) , find the value of y .

Show that the line joining the points (4,5) and (1,2) is parallel to the line joining the points (9,-2) and (12,1) .

Show that the line joining the points (4,5) and (1,2) is parallel to the line joining the points (9,-2) and (12,1) .

Determine the values of a and b for which the straight line joining the points (7, 4, 2) and (3, -2, 5) may be parallel to the line joining the points (2, a, 5) and (b, -15, 11).