`0.3x + 0.7y = .13`
`0.4x + 0.5y = .13`

Solve the following pair of linear equations by the substitution method: 0.2x + 0.3y =1.3 0.4x + 0.5y= 2.3

0.4 x + 0.3 y = 1.7 , 0.7 x - 0.2 y = 0.8

{:(0.4x + 0.3y = 1.7),(0.7x - 0.2y = 0.8):}

Solve the following equations : 0.2x+0.3y=1.3 0.4x+0.5y=2.3

If 0.5x+0.7y=0.74 and 0.3x+0.5y=0.5 then

( 9)/(x) - ( 4)/( y) = 8 , ( 13)/(x) + ( 7)/(y) = 101 ( x ne 0, y ne 0 )

6x - 5y - 16 = 0 , 7x - 13 y + 10 = 0 .