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3. 4x-2x = 7+5 ... 2x = 12 ... x = 12/2 ... x = 6
4.
x= 4a/ 2
x= 2a ( jawaban C)
3. 4x-5 = 2x+7
4x-2x= 7+5
2x= 12
x= 12:2
x= 6 ( jawaban D)
4.x+y= 6. x- y= 2
x= 2+y
x+y= 6. x-y=2
2+y+y=6. x= 2+ y
2+2y=6. x= 2+2
2y= 6-2. x= 4
2y=4
y= 2
jawaban C
5. x+y=7. 5x-y= 5
5x-5=y
x+y=7
x+5x-5=7
6x= 12
x= 2
jawaban C