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djyliett [7]
3 years ago
5

4x²-y²=171 and 2x-y=9, value of 2x+y

Mathematics
1 answer:
Anna007 [38]3 years ago
4 0
So you will need to solve for x and y before evaluating 2x+y....

2x-y=9, y=2x-9  now this will make 4x^2-y^2=171 become:

4x^2-(2x-9)^2=171

4x^2-(4x^2-36x+81)=171

36x-81=171

36x=252

x=7, now we can use 2x-y=9 to solve for y...

2(7)-y=9

14-y=9

-y=-5

y=5

now we know that x=7 and y=5, 2x+y becomes:

2(7)+5

14+5

19
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<h3>What is simple interest and compound interest?</h3>

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To learn more about future value, please check: brainly.com/question/18760477

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