xxmattieboo7xx
15.03.2020 •
Mathematics
Which of these systems of equations has a solution of (6,-7)?
A.x-2y=20
2x-y=19
b.x-2y=20
2x+y=19
c.x+2y=20
2x-y=19
d.x+2y=20
2x+y=19
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Ответ:
write as a whole decimal
Step-by-step explanation: