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matrenka [14]
3 years ago
8

Solve the system using elimination. -2x+6y=18 -4x-6y=18

Mathematics
2 answers:
Serga [27]3 years ago
8 0
Line each equation up and add together

oksano4ka [1.4K]3 years ago
3 0

Answer:

(-6,1)

Step-by-step explanation:

-2x+6y=18

-4x-6y=18

Add the two equations together to eliminate y

-2x+6y=18

-4x-6y=18

--------------

-6x   = 36

Divide each side by -6

-6x/-6 = 36/-6

x = -6

Now we need to find y

-2x +6y = 18

-2(-6) +6y = 18

12 +6y = 18

Subtract 12 from each side

12-12 +6y = 18-12

6y = 6

Divide by 6 on each side

6y/6 = 6/6

y = 1

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The length of a rectangle is 5 cm less than twice its width. The perimeter of the rectangle is 26 cm. What are the dimensions of
alexgriva [62]

width = w

length = 2w - 5

Perimeter = 26

The formula for perimeter is:

P = l + l + w + w

Plug in corresponding values into this equation...

26 = (2w - 5) + (2w - 5) + w + w

Now you must solve for w

26 = 2w - 5 + 2w - 5 + w + w

Combine like terms

26 = 2w - 5 + 2w - 5 + w + w

26 = 6w - 5 - 5

26 = 6w - 10

Bring -10 to the other side by adding it to both sides

26 + 10 = 6w + (-10 + 10)

36 = 6w + 0

36 = 6w

Isolate w by dividing 6 to both sides

36/6 = 6w/6

6 = w

Width is 6 cm

To find length plug 6 in for w in the equation 2w - 5

2(6) - 5

12 - 5

7

Length is 7 cm

Hope this helped!

~Just a girl in love with Shawn Mendes

4 0
3 years ago
What is 1.2 divides by 0.04?
Jobisdone [24]
1.2=\frac{12}{10} and 0.04=\frac{4}{100}. Divide 12/10 by 4/100: \frac{12}{10}: \frac{4}{100}=30
7 0
2 years ago
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Compare the numerical expressions.
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Answer + Step-by-step explanation:

<u>24 + 7 and 9×(24+7)</u>

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<u>3×(21 + 4) and 21 + 4</u>

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the number is multiplied by 3

making the left side 3 times larger

<u>40 × 5 and 40 × 20​</u>

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The kiwi are 50 cents each. Therefore, Lisa can buy ten kiwi. What did you mean by the examples?
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Answer:

The answer is 576 inches

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