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worty [1.4K]
3 years ago
10

X-4y=28 2x+y=2 Elimination

Mathematics
1 answer:
makvit [3.9K]3 years ago
3 0

\left\{\begin{array}{ccc}x-4y=28\\2x+y=2&\text{multiply both sides by 4}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}x-4y=28\\8x+4y=8\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad9x=36\qquad\text{divide both sides by 9}\\.\qquad\boxed{x=4}\\\\\text{Put the value of x to the second equation:}\\\\2(4)+y=2\\8+y=2\qquad\text{subtract 8 from both sides}\\\boxed{y=-6}\\\\Answer:\ \boxed{x=4\ and\ y=-6\to(4,\ -6)}

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In January Jennifer was allowed to use 150 text messages. If she is allowed to use the same amount of text messages every month.
Firlakuza [10]

She would have used 1200 messages in all by the month of August.

Step-by-step explanation:

Messages allowed per month = 150

There will be 8 months starting from January to August, therefore,

Time period = 8 months

Messages in 8 months = Messages per month * Time period

Messages\ in\ 8\ months=150*8\\Messages\ in\ 8\ months=1200

She would have used 1200 messages in all by the month of August.

Keywords: Multiplication

Learn more about multiplication at:

  • brainly.com/question/629998
  • brainly.com/question/6208262

#LearnwithBrainly

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Find an equation of the line that passes through the point (4, 3) and is perpendicular to the line 2x + 9y − 6 = 0.
vesna_86 [32]
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3 years ago
The perimeter of a parallelogram is 72 meters.The width of the parallelogram is four meters less than its length. Find the lengt
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Parallelogram have 4 sides.

Use the distributive property. 2 multiply the last and negative 4 in the parentheses.
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+8. +8

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4. 4

l= 20

The width of the parallelogram is four meters less than its length.

4 sides
2 length = 20
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I got 16 by subtracting 4 from 20

Comment if you need any other help :)
4 0
3 years ago
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