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25-09-2020
Mathematics

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Use substitution 9x-3y=9 3x-y=3

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haichoi0330 haichoi0330

26-09-2020

Answer:

x=1

Step-by-step explanation:

3x-y=3

y=3-3x

9x-3y=9

9x-3(3-3x)=9

9x - 9 + 9x=9

9x + 9x=9 + 9

18x=18

x=18÷18

x=1

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