In the X – Y plane, three lines are concurrent. Their equations

3x+4y=6

5x+4y=4

zx+4y=5

Find the value of the constant z

23

25

27

29

Correct Answer : D

simplifies to

If ax +by + c = 0 and dx + ey + f = 0 represent the same straight line then which of following is necessarily satisfied?

A rhombus has sides 10cm each and the circle that is inscribed in it has radius 1.5cm. What is the area of the rhombus in cm^{2}