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2x - 4y = 14 --> x - 2y = 7
_________ -
3y = - 6
y = - 2
x = 3
6x - 2y = 6(3) - 2(-2)
= 18 + 4
= 22
2x-4y=14 |*3 6x-12y=42
__________ -
18y=-36
y=-2
3x+3y=3
3x+3(-2)=3
3x=3+6
x=3
jadi nilai dari 6x-2y= 6(3)-2(-2)=18+4=22