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80 POINTS -Pre Calc Questions
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80 POINTS -Pre Calc Questions

80 POINTS -Pre Calc Questions-example-1
User Unix One
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Answer:

x+y=30

2x+3y=80

multiplying equation one by -3 and add equation

-3x -3y=-90

2x +3y=80

2(10)+20(3)=80

80=80

User Serban Razvan
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