Solve the following pair of linear equations by the substitution method(i) x + y = 14 ; x - y = 4(ii) s - t = 3 ; s/3 + t/2 = 6 (iii) 3x - y = 3 ; 9x - 3y = 9(iv) 0.2x + 0.3y = 1.3 ; 0.4x + 0.5y = 2.3 (v) √2x + √3y = 0 ; √3x - √8y = 0 (vi) 3x/2 - 5y/3 = - 2 ; x/3 + y/2 = 13/6