airrbae
What is the solution for this system of linear equations? I'm stuck,
y=-2x+1
y+7x-17
so -2x+1=7x-17
??
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anonymous
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if the second one is \(y=7x-17\) then yes
anonymous
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\[-2x+1=7x-17\]
anonymous
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add \(2x\) to both sides
add \(17\) to both sides
divide both sides by \(9\) will get you \(x\)
anonymous
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if you want me to check your answer, let me know
airrbae
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so I get 1=9x-17
then 9 divided 18 = 2?
so x=2?
anonymous
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you got it
airrbae
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how would I find y with this one?
anonymous
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then of course you have to find \(y\) but since you know \(x=2\) that should be easy
anonymous
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replace \(x\) by \(2\) in either equation
if you want to check to make sure your answer is right, put \(2\) for \(x\) in both and see if you get the same number
airrbae
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is y=15?
or y=3?
I got a different answer when I pluged 2 into both problems /:
anonymous
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should be the same
lets check
anonymous
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\[y=-2x+1\]
\[y=-2\times 2+1=-4+1=-3\]
anonymous
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\[y=7x-17\]
\[y=7\times 2-17=14-17=-3\]
anonymous
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so you should get \(y=-3\) for both, i am not exactly sure how you got the 15
airrbae
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okay now I see what I did wrong there, hmmm!
thank you for showing both, I wouldn't have seen it if you hadn't!
anonymous
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yw