Solve each system by elimination

Mathematics

1 answer:

MaRussiya [10]3 years ago

3 0

X-y=11
2x+y=19
add them

x-y=11
<u>2x+y=19 +</u>
3x+0y=30

3x=30
divide 3
x=10

sub baack
x-y=11
10-y=11
minus 10
-y=1
times -1
y=-1

(x,y)
(10,-1)

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