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Answer:
Step-by-step explanation:
Given that,
152 x - 378 y = -74 ........1
-378 x + 152 y = -604 ........2
Adding equations 1 and 2,
152 x - 378 y - 378 x + 152 y = -74-604
or 152(x+y) - 378(x+y) = -678
or -226(x+y) = -678
or x+y =-678/-226 = 3
Subtracting equation 2 from 1,
152 x - 378 y +378 x - 152 y = -74+604
or 152(x-y) + 378(x-y) = 530
or 530(x-y) 530
or x-y = 530/530 =1
Thus, x+y=3 and x-y =1
Therefore x+y : x-y = 3/1 =3
Answer is 3
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