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∠R = ∠C ⇒ 98°
maka :
7x - 4y = 98 (kali 5) 35x - 20y = 490
4x + 5y = 107 (kali 4) 16x + 20y = 428
------------------------ +
51x = 918
x = 918/51
x = 18
Masukan nilai x :
7x - 4y = 98
7(18) - 4y = 98
126 - 4y = 98
-4y = 98 - 126
-4y = -28
y = -28/-4
y = 7
Jadi, x = 18 dan y = 7
Maka :
2x + y
= 2(18) + 7
= 36 + 7
= 43
Jawaban C.
Semoga membantu :)