Question

please solve is
Cramer's rule ​

Answer 1

let 1/x be a and 1/y be b
hence
4a+5b=7...(1)
3a+4b=5...(2)


D=4......5= 4×4-5×3 =16-15 = 1
......3......4

Dx=7.......5 = 7×4-5×5 = 28-25 = 3
........5.......4

Dy=4........7= 7×3-5×4. = 21-20 = 1
........3........5


applying cramer's rule
x=Dx/D
=3/1
=3

y=Dy/D
y=1/1
y=1

hope this help:-)