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x+3y = 6 | x3 | 3x + 9y = 18 -
-11y = -11
y = 1
3x-2y = 7
3x-2.1=7
3x=9
x = 3
3a + b
3.3 + 1 = 10
semoga membantu^^
x+3y=6 [x3] ⇒ 3x+9y=18 - x+3(1)=6
-11y=-11 x+3=6
y=-11/-11=1 x=6-3=3
y=1
x=3
Jadi, 3a + b = 3(3) + 1 = 9 + 1 = 10