Question

If 12x+17y=48and17x+12y=68then what is the value of x-y=?

Answer 1

12x+17y=48------(1)

7x+12y=68-----(2)

mutiplying both equation(1)by17and equation (2)by12

we get,

204x+289y=816-------(3)

204x+144y=816------(4)

by eqiating equation 3and 4 we get

y=0

and putting the value of y in equation (1) we get

x=4

now,

x-y=4-0=4