Find the value of y :
`4/7 (y + 7 ) = 4`

Find the value of : 7^4

Find the value of   3 4/7 ÷ 7

Find the value : (7!)/(4!)

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

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

Find the value of y when (5y-7)/(3y)=2

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

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

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