what is the solution to 3x-y=4 and 2y+x=11

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21-01-2016
Mathematics

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what is the solution to 3x-y=4 and 2y+x=11

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Panoyin Panoyin · Answer 1 · 2016-01-21T18:23:21-05:00

3x - 1y =   4 ⇒ 9x - 3y = 12
1x + 3y = 11 ⇒ 1x + 3y = 11
10x = 23
10   10
x = 2.3
  3x - y = 4
3(2.3) - y = 4
6.9 - y = 4
- 6.9   - 6.9
-y = -2.9
-1 -1
y = 2.9
  (x, y) = (2.3, 6.9)