Find the values of `7x -5y = 9`, `5x-7y = -15`

Find the value of (x-y), if 2x-5y=5,5x-8y=14

Find the value of (x+y) ,if 3x+5y=9,5x+3y=7

Find the value of (x-y) , if 5x+4y=14,4x+5y=13

Find the value of x, if 2x+y=7 and y=-3

Find the value of (x+y),if 5x-2y=10,x+8y=26

Find the value of y in the equation 2x+y=7 , if x=2 . Find x if y =-1 .

Find the value of x and y which satisfy the following equation (x, y in R): If x+2i+15 i^6 y= 7x+ i^3 (y+4), find (x+y)

The value of k for which the lines 7x -8y +5=0, 3x-4 y+5 =0 and 4x+5y+k =0 are concurrent is given by