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2x+y=9 | x3
--> 5x-3y=28
6x+3y=27 +
11x=55
x =5
5x-3y=28
5(5) - 3y = 28
- 3y = 28 - 25
- 3y = 3
y = -1
-> 3x - 4y
= 3(5) - 4(-1)
= 15 + 4
= 19
2x + y - 9 = 0 ⇔ 2x + y = 9
5x - 3y = 28 |×1| ⇔ 5x - 3y = 28
2x + y = 9 |×3| ⇔6x + 3y = 27+
11x = 55
x = 5
2x + y = 9
2(5) + y = 9
10 + y = 9
y = 9 - 10
y = -1
jadi 3x - 4y = 3(5) - 4(-1)
= 15 + 4
= 19