急急急~~~~~~~~~~~~~問2題數學題!!!!!!!!!

1.
1.2x+3y/6=4
1.2x+3y/6x6=4x6
1.2+3y=24
1.2+3y-1.2=24-1.2
3y=22.8
3y/3=22.8/3
y=7.6

2.(呢題有少少麻煩,因為要搵兩個代數,仲有好多選擇tim,下面果個係其中一個答案)
6x-y/3=4
6x-y/3x3=12x3
6x-y=36
6x7-6=36
x=7 y=6

3.(呢個同第2題既問題一樣,處理手法我都會一樣咁做)
2.3x/2+y=15
2.3x/2x2+y=15x2
2.3x+y=30
2.3x10+7=30
x=10 y=7

4.(同2,3題一樣)
9x-2y=18
9x3-2x4.5=18
x=3 y=4.5

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1.2x+3y/6=4

6x-y/3=4

2.3x/2+y=15

9x2y=18