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3x + y = 4 x - 2y = 3
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5 votes
3x + y = 4
x - 2y = 3

User Question User
by
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1 Answer

6 votes
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)

( (11)/(7), (-5)/(7))

User Stephen Fuhry
by
7.9k points
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