3 years ago

4x²-y²=171 and 2x-y=9, value of 2x+y

1 answer:

8 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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ioda

Answer:

Step-by-step explanation:

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or another way start with multiplying 5 and n equaling 5n=

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3 0

3 years ago

Guys do you know this?

TEA [102]

Answer:

That would be 2/7

Step-by-step explanation:

Using substitution. x^2 +x+1 at 1 is 7

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6 0

3 years ago

I don't want the answer, I want to know how to do it. What is the ratio of 4/5 to 7/15?

Ostrovityanka [42]

Answer:

$\displaystyle 1\frac{5}{7}$

Step-by-step explanation:

$\displaystyle \frac{4}{5} \div \frac{7}{15} = \frac{4}{5} \times \frac{15}{7} = \frac{60}{35} = 1\frac{5}{7}$

I can assist whenever I can.

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4 years ago

The answers are already there, I just need the work. I'm giving all of my points into this one :)

Radda [10]

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3 years ago

PLS HURRY!

Ratling [72]

A is the correct answer 3 terms and a degree of 9:)

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3 years ago