Which system is equivalent to

1

5x2 + By2 = 50

(7x² + 2y² = 10²

(A) 5x2 + By2 - 50

7-21x² - by² = 10

(B) 5x2 + by2 = 50

-21x²-by? - 30

(C) 35x2 + 42y2 = 250

(-35x2 - 10y2 - -50

(D) 35x2 + 42y2 = 350

-35x2 - 10/2 - -50

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We need to substitute these problem you can take first one to understand

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