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

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asked Jul 12, 2018 178k views

1 Answer

Stephen Fuhry · Answer 1 · 2018-07-19T03:11:23+0000

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))

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

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