Find the value of x and y if:
(a) `(x-4, 7) = (4,7)`

Find the value of 7 1/2=4/x

Find the value of x: 3 - x = 4 x - 7

find the value of x - 1/x if x = 7-4sqrt5

For solving the following sikmultaneous equations by Cramer's rule, find the values of D_x and D_y : 3x - y = 7, x + 4y = 11

Find the value of x , if y = 2 x − 5 and y = 7 .

Find the values of (x-y) , if (i) 3x + 4y = 11 , 4x + 3y = 10 (ii) 3x + 2y = 8 , 2x + 3y = 7

Find the value of : ( x / y )^x times ( y/x )^y , x = 4 , y = -7

Find the value fo x:y, if (7x - 15y)/(4x + 6y) = (5)/(6).

Find the value of x for which ((4)/(9)) ^(4) xx ((4)/(9)) ^(-7) = ((4)/(9)) ^(2x -1)