Find the value of `x + y`, if
`12x+13y=29` and
`13x+12y=21`

Find the value of (x+y) and (x-y) , if (i) 15x-17y=11 , 17x-15y=21 . (ii) 12x+13y=29 , 13x+12y=21 .

Find the values of x and y, if 2[{:(1,3),(0,x):}]+[{:(y,0),(1,2) :}]=[{:(5,6),(1,8):}].

If X : Y = 13 : 12 and X - Y = 2, then what is the value of 2X + 3Y? यदि X : Y = 13 : 12 तथा X-Y = 2 है, तो 2X+3Y का मान क्या होगा ?

Solve for x and y: 2x - 3y-13 =0 , 3x -2y+12 =0

If the AM of 13, 15, 16, 12, x be y and that of 13, 15, 16, 12 , y be x, then find x and y.

Solve : 8x + 13y - 29 =0 12 x- 7y - 17=0

Group the like terms from the algebraic expressions given: 2x, y, 12xy, 13y^2 , -5x, 18y, -4xy, -2y^2 , 21x^2y , 3x, 3xy, -xy, -y, -6x^2 , -15x^2 .