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luticiawright luticiawright
  • 13-02-2017
  • Mathematics
Answered

3x + y = 4

x - 2y = 3

Verified Answer :

apologiabiology
apologiabiology apologiabiology
  • 13-02-2017

eliminate y's
multily top equation by 2 and add to 2nd

6x+2y=8
1x-2y=3 +
7x+0y=11

7x=11
x=11/7
sub back


x-2y=3
11/7-2y=3
add 2y both sides
11/7=2y+3
minus 3 which is 21/7
-10/7=2y
divide by 2 or times 1/2
-5/7=y


(x,y)
\(( \frac{11}{7}, \frac{-5}{7})\)

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