queenzoe20 queenzoe20

03-11-2017
Mathematics

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Solve the system of equations 3y + 2z = 12 and y – z = 9

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Аноним Аноним

03-11-2017

mulitply second equation by 2 and add to first

3y+2z=12
2y-2z=18 +
5y+0z=30

5y=30
divide 5
y=6

sub back
y-z=9
6-z=9
minus 6
-z=3
times -1
z=--3

x=-3
y=6

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