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3 years ago

Use substitution to solve the system of equations. 28 = x – 7y –3x + 9 =4y

Mathematics

2 answers:

Serggg [28]3 years ago

5 0

The answer is (7,-3)

erica [24]3 years ago

4 0

Hello!

<h2>Answer:</h2>

$\boxed{ \bf Solution:~(7,-3)}$

<h2>Explanation:</h2>

I solved the problem in the image attached below. Go check it out! If you don’t understand a certain step, you may ask me in the comments.

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Blizzard [7]

$0.\overline{7}=0.777...\\\\x=0.777...\qquad\text{multiply both sides by 10}\\\\10x=7.777...\\\\\text{Make the difference}\\\\10x-x=7.777...-0.777...\\\\9x=7\qquad\text{divide both sides by 9}\\\\x=\dfrac{7}{9}\\\\Answer:\ \boxed{0.\overline{7}=\dfrac{7}{9}}\\-----------------\\You\ can\ remember\\\\\dfrac{1}{9}=0.\overline{1}\\\\\dfrac{2}{9}=0.\overline{2}\\\\\dfrac{3}{9}=0.\overline{3}\\\\\dfrac{4}{9}=0.\overline{4}\\\vdots\\\\\dfrac{8}{9}=0.\overline{8}$

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3 years ago

Find the domain for the rational function:

jenyasd209 [6]

Answer:

3rd Option

Step-by-step explanation:

Since the denominator cannot equal 0, x ≠ 5. Therefore, our domain stops and starts again at 5. So our answer is 3rd option.

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3 years ago

In 1 hr, a plane can travel 440 mi into the wind and 480 mi with the wind. Find the wind speed and the rate of the plane in stil

nexus9112 [7]

Answer:

the plane would fall and crash at 150mph

Step-by-step explanation:

8 0

3 years ago

The Art and History Museum offers a family discount card for a donation of $57. I The table shows the price per person with and

Murljashka [212]

Answer:

8 number of visits will be the total cost of the visits (including the price of the discount card) be less expensive for a family of 2 adults and 1 child if they have purchased the discount card

Step-by-step explanation:

Price without Discount Card Price with Discount Card

Ticket (12 & Under) $10 $8

Adult's Ticket $15 $12

Let x be the number of visits

Price without discount card for 2 adults and 1 child ticket

Price without discount for x visits = $x(15 \times 2+ 10)=40x$

Price with discount for x visits = $57+ x(12 \times 2+ 8)=57+32x$

Now to find For what number of visits will the total cost of the visits (including the price of the discount card) be less expensive for a family of 2 adults and 1 child if they have purchased the discount card

57+32x< 40x

57<8x

7.1<x

So, 8 number of visits will be the total cost of the visits (including the price of the discount card) be less expensive for a family of 2 adults and 1 child if they have purchased the discount card

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3 years ago

Whats 1/3 of 1/2? thanks!

GuDViN [60]

Answer:

It's 1/6, hope this helps!

7 0

2 years ago

Read 2 more answers