1.

Solve for X and y 139x+56y=641 ,56x+139y=724​

Answer»

Step-by-step explanation:

Let the given equations be ;

139x + 56y = 641 -------- (1)

56x + 139y = 724 --------- (2)

On adding EQ. 1) & 2) we get ;

195x + 195y = 1365

195(X + y) = 1365 [ on taking 195 as common ]

x + y = 1365/195

x + y = 7 ------- (3)

Now, SUBTRACTING eq.2) from 1) we get,

83x - 83y = -83

83 (x - y ) = -83

x - y = -83/83

x - y = -1 ------- (4)

Adding eq.3) and 4) we get ;

2x = 6

x =3

On putting value of "x" in eq.4) we get ;

3-y = -1

y = 4



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