asdfjk6421
19.07.2019 •
Mathematics
Ajet flew from new york to london in 7 hours the average speed was 499.4 miles an hour how many miles was the trip
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Ответ:
Ответ:
Step-by-step explanation:
Since y= -7x you will want to substitute the y in the other equation.
2x -(-7x) = -9
2x + 7x = -9
9x = -9
so x will be -1
y= -7(-1)
x= -1
y= 7