Question

If 13×+12y=75 and 12×+13y=25

Answer 1

13×+12y=75--------(1)

12×+13y=25--------(2)

multiple by 12 in equ 1

multiple by 13 in equ 2

156x+144y=900

156x+169y=325

(-) (-) (-)

-25y= 575

y= -575/25

y=-23----------(3)

equ (3) substitute in equ (1)

13×-12y=75

13x-12(23)=75

13x-276=75

13x=75+276

13x=351

x=351/13

x=27

x= -23 y=27

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