Diketahui sistem persamaan linier 2x+3y=8 dan 7x-y=5 nilai dari 9x – 5y=​

2x + 3y = 8
7x – y = 5 x 3

2x + 3y = 8
21x – 3y = 15
23x = 23
x = 1

7 – y = 5
-y = -2
y = 2

9x – 5y
= 9 – 10
= -1