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Serhud [2]
3 years ago
15

3x – y = 28 3x + y = 14

Mathematics
1 answer:
podryga [215]3 years ago
5 0

Step-by-step explanation:

3x=28+y

x=28+y÷3

then puttingx=28+y÷3

3x=14+y

3(28+y÷3)+y=14

84+3y+3y=42

3y+3y=42-84

y=-42÷6

y=7

so putting y=-7

3x-y=28

3x-7=38

x=38+7÷3

x=15

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