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Lerok [7]
4 years ago
7

3x+y=7 6x+4y=22 can somebody help me solve this problem?

Mathematics
1 answer:
swat324 years ago
5 0
Hey there!

\boxed{x=1;y=4}

3x + y = 7 \\ \\ 
    6x + 4y = 22

y = -3x + 7 \\ \\ Plug \ this \ in \ for \ variable \ (y) \ in \ equation \ \\ \\ 

       6x + 4*(-3x+7) = 22 \\ \\ 
       -6x = -6 \\ \\ 6x=6 \ x+1 \\ \\ x=1 \ y=-3x+7 \\ \\ \boxed{y=-3(1)+7=4} \\ \\ \boxed{\boxed{x=1;y=4}}

I hope this helps you!
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Ellen deposits $6,773 into an account earning 1% annually, After seven years what will Ellen's balance have grown to, including
lara31 [8.8K]
<span>If Ellen deposited 6 773 dollars in her account and did not withdraw any amount for 7 years.
Then she will earn this amount.
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=> first year = 6 773 x .01 = 67.73
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=> Second year = 6840.76 * .01 = 68.4073
=> 68.4073 + 6840.76 = 6909.1673
=> Third year = 6909.1673 * .01 = 69.09
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=>4th year = 6978.26 * .01 = 69.78
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=> 5th year = 7004 *.01 = 70.04
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=> 6th year = 7074.04 * .01 = 70.74
=> 70.74 + 7074.04 = 7144.78
=> 7th year = 7144.78 *.01 = 74.45
=> 7144.78 + 74.45 = 7216.23</span>



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4 years ago
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