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Mathematics 21 Online
OpenStudy (anonymous):

Choose the Standard Form of the equation y = - x - 3 x + y = -3 7x + y = -3 x + 7y = -21 -7x + y = -21

Parth (parthkohli):

Add x on both sides to get the standard form.

OpenStudy (precal):

x+y=-3

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