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24-01-2020
Mathematics

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use substitution to solve the system -5x+2y=20 and x=3y-17

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24-01-2020

-5(3y-17)+2y=20, -15y+85+2y=20, -13y+85=20, -13y=-65, y=5, x=3(5)-17, x=15-17, x=-2, -5(-2)+2(5)=20, 10+10=20, 20=20

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