I need help solving x+y=4 2x+y=6

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asked Oct 7, 2016 144k views

1 Answer

Teocali · Answer 1 · 2016-10-12T17:01:32+0000

x+y=4
2x+y=6
make first equation negative
-x-y=-4
add to first equation
2x-x+y-y=6-4
x=2

subsitute
x+y=4
2+y=4
y=2

or
x+y=4
subtract x from both sdies
y=4-x
subsitute 4-x for y in second equation
2x+4-x=6
x+4=6
x=2

I need help solving x+y=4 2x+y=6

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