2x-7y=35 5x+3y=26 Nilai dari 3x - 4y adalah???

2x-7y=35 (*5)
5x+3y=26 (*2)

10x - 35y = 175
10x + 6y = 52
Dikurangi semua
-41y = 123
-y= 3
Y= -3

5x + 3y =26
5x + 3(-3) = 26
5x - 9 = 26
5X = 26 + 9
5x = 35
X = 35/5 = 7

Nilai dari 3x - 4y adalah???
3(7) -4(-3) =
21 + 12 = 33