1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
jeka57 [31]
3 years ago
10

1-Determine a solução dos sistemas abaixo pelo método de adição: a) {x + y = 5 {2x- y=9 b) {3x - y = 10 {x + y =18 Prfvr gente

Mathematics
1 answer:
xeze [42]3 years ago
5 0

a)

X + Y = 5

<u>2X - Y = 9     </u>  

X + 2X + Y - Y = 5 + 9

3X = 14

<h3>X = 14/3</h3>

Para Y, basta substituir o valor de X em qualquer uma das 2 equacoes - arbitrariamente. Escolhendo a primeira:

X+ Y = 5

14/3 + Y = 5

Y = 5 - 14/3

<h3>Y = 1/3</h3>

.........................

b)

3X - Y = 10

<u>X + Y = 18       </u>  

3X + X - Y + Y = 10 + 18

4X = 28

<h3>X = 7</h3>

Para Y, basta substituir o valor de X em qualquer uma das 2 equacoes - arbitrariamente. Escolhendo a segunda:

X + Y = 18

7 + Y = 18

Y = 18 - 7

<h3>Y = 11</h3>
You might be interested in
John can mow the golf course in 7 hours Larry can mow it in five hours form a rational equation that can be used to determine ho
Anton [14]
See attached formula:
Time = (7 * 5) / (7+5)
Time = 35 / 12
Time = <span><span><span>2.9166666667 </span> Hours
</span> </span>

4 0
3 years ago
AWNSER FOR 99 POINTS!What is the volume of the pyramid? A. 2470 cm3 B. 4940 cm3 C. 7410 cm3 D. 14,820 cm3
fgiga [73]
The answer is B.4940. I found the picture of the pyramid u forgot to post. The volume for pyramid is lwh/3
5 0
3 years ago
Read 2 more answers
A parallelogram has sides of length 7.7 millimeters and 17.2 millimeters. What is the perimeter?
Arlecino [84]
Solutions 

We know that a rectangle has four sides and the perimeter of a rectangle is the distance around the outside of the rectangle.The opposite sides of a rectangle are congruent To find the perimeter you have to use the formula 2 × <span>(Side A + Side B). 
</span>
We have the side lengths 7.7 mm and 17.2 mm. 

Solve 

2 × <span>(Side A + Side B) 
2 </span>× <span>( Side A (7.7) + Side B (17.2) )  
</span>= (7.7 x 2) + (17.2 x 2) 
= 49.6

<span>The perimeter is 49.6 mm².  </span>
6 0
3 years ago
Read 2 more answers
What is the length of line segment "AC"?​
Doss [256]
Hey mate your answer in attachment

8 0
3 years ago
I need help plsss<br> Nowww
enyata [817]
8: tenths
9:hundredth
7:thousandth
8 0
3 years ago
Other questions:
  • Q is 3 more than half of x
    7·2 answers
  • You're flying from Joint Base Lewis-McChord (JBLM) to an undisclosed location 201 km south and 194 km east. Mt. Rainier is locat
    10·1 answer
  • Jake volunteers to help out his younger brother's basketball team in his free time. One of his tasks is to ensure that all the b
    9·2 answers
  • What is the actual distance between Gendet and Montrose PLEAZZZE HELP
    9·1 answer
  • What is the value of 8+ n, when n is equal to 15?
    13·2 answers
  • The number m satisfies the relationship m&lt;0. Write an inequality expressing the relationship between -m and 0. Explain your r
    6·1 answer
  • Quiz Instructions
    14·1 answer
  • -24x(x-27). multiply
    8·2 answers
  • A,b,c or d between what two intergers
    10·1 answer
  • Use formulas to find the lateral area and surface area of the given prism. Round your answer to the nearest whole number. 4m,13m
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!