If   satisfy the liner equation 3x + ky = 4, find the value of k, Can there be more than one value of k?

55. Draw the graph of each of the following linear equations in two variables:

3 = 2x +y

From the choices given below, choose the equation whose graphs are given in Fig. (1) and Fig. (2).

For Fig. 1                     For Fig. 2

(i) y = x                      (i) y = x + 2
(ii) x + y = 0               (ii) y = x – 2
(iii) y = 2x                  (iii) y = – x + 2
(iv) 2 + 3y = 7x          (iv) x + 2y = 6


Fig.  1




Fig. 2

If the work done by a body on application of a constant force is directly proportional to the distance travelled by the body, express this in the form of an equation in two variables and draw the graph of the same by taking the constant force as 5 units. Also read from the graph the work done when the distance travelled by the body is

(i) 2 units (ii) 0 unit.