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

D

Step-by-step explanation:

Because If you add together to eliminate x you multiply the top by 7 and the bottom by 5 and you get d and that cancles out x. Sorry bad at explaining.

Geometric sequence

Step-by-step explanation:

Multiply each term by 2 to get the next term.

To see this divide the next term by the previous term. 216/108= 2, 432/216= 2, 864/432= 2.