Question

if 12 x +17y=48 and 17 x +12y=68,then what is the value of x-y ​

Answer 1

12x+17y=48 ×12

17x+12y=68 ×17

144x+204y=57

289x+204y=1156

−145x=−580

x=4

substitute x value in the 1st equation

12×4+17y=48

48+17y=48

17y=0

then

x−y=4−0=4