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Flura [38]
3 years ago
5

Solve the system by substitution. 3x + y = 20 -7y=x Please help

Mathematics
1 answer:
alisha [4.7K]3 years ago
8 0

9514 1404 393

Answer:

  (x, y) = (7, -1)

Step-by-step explanation:

The expression for x makes it easy to use that for substitution.

  3(-7y) +y = 20

  -20y = 20 . . . . . collect terms

  y = -1 . . . . . . . . . divide by -20

  -7(-1) = x = 7 . . . use y in the second equation to find x

The solution is (x, y) = (7, -1).

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