47x+31y=63;31x+47y=15quad quad (3" mark "

5x + 2y = 31 3x + 7y = 36

1 15 16 31 47 78 125 ?

63, 31, 15, 7, 3, ?

Solve the following equations. 47x+31y=2,31x+47y=15

The lines 2x-3y=5 and 3x-4y=7 are the diameters of a circle of area 154 sq.units. Then the equation of the circle is x^(2)+y^(2)+2x-2y=62x^(2)+y^(2)+2x-2y=47x^(2)+y^(2)-2x-2y=47x^(2)+y^(2)-2x+2y=62

Prove that the equations 6x^(2) + xy -12y^(2)–14x + 47y -40 = 0 and 14x+ xy- 4y^(2)-30x +15y= 0 represents two pairs of concurrent lines and that lines of first pair are equally inclined to those of second pair.

The marks (out of 50) of 10 students in a class are : 40, 34, 37, 50, 47, 42, 31, 46, 36, 43 Find the median marks.

Solve the following system of equations: " (21)/(x)+(47)/(y)=110; (47)/(x)+(21)/(y)=162 and x,y!=0