if 19x-17y=55 and 17x-19y=53 then x-y is?? (1) -3 ,(2) 1/3 ,(3) 5 ,(4) 3
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19x-17y=55......eq i
x. = 55+17y/19
17x-19y=53....eq ii
putting the value of x in eq ii
17x-19y=53.
17 × 55+17y/19 - 19y = 53
935+289y/19 -19y = 53
935 +289y -361y/19 = 53
935 -72y = 1007
-72y = 1007 - 935
-72y = 72
y = -1
putting y = -1 in eq i
19x-17y = 55
19x +17 = 55
19x = 55 - 17
19x = 38
x = 38/19
x = 2
a/q
x - y = 2-(-1) = 2+1 = 3
hope it helps you
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