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
eduard
3 years ago
11

5x + 7y = 25 5x - 2y = -65 solve using elimination (step by step please)

Mathematics
1 answer:
aliina [53]3 years ago
6 0

5x+7y=25

5x-2y=-65

subtract both of the equations

5x-5x=0

7y--2y= 7y+2y=9y

25--65=25+65=90

0+9y=90

9y=90

divide both sides by 9 to get y by itself

9y/9=90/9

cross out 9 and 9 which becomes 1*1*y=y

90/9=10

y=10

find x by using the substitution method

5x+7y=25

5x+7(10)=25

5x+70=25

move +70 to the other side

sign changes from +70 to -70

5x+70-70=25-70

5x=-45

divide both sides by 5 to get x by itself

5x/5=-45/5

cross out 5 and 5 then becomes 1*1*x=x

-45/5=-9

x=-9

answer:

(-9,10)

You might be interested in
A local mattress manufacturer wants to know if its manufacturing process is in or out of control and has hired you, a statistics
balandron [24]

Answer:

a. 95.4

b. UCL = 96.07

LCL = 94.73

c.  Process is in control

Step-by-step explanation:

a. The computation of estimate mean is shown below:-

Estimate\ mean = \frac{\Sigma X}{N} \\\\ = \frac{1908.000}{20}

= 95.4

b. The computation of Upper Control Limit (UCL) and the Lower Control Limit (LCL) for the manufacturing process is shown below:-

UCL = Mean + \frac{3\times \sigma }{\sqrt{Sample\ size} }

UCL = 95.4 + \frac{3\times (0.5)}{\sqrt{0.5} }

= 95.4 + 0.67082

= 96.07

UCL = Mean - \frac{3\times \sigma }{\sqrt{Sample\ size} }

UCL = 95.4 - \frac{3\times (0.5)}{\sqrt{0.5} }

= 95.4 - 0.67082

= 94.73

c. The explanation is shown below:-

From the above calculation we can see that the sample lies between LCL AND UCL that is (94.73 ,96.07) ,  

The Process is in control

7 0
3 years ago
Stuck on this question. Nether learned this anywhere
Vlad [161]

Answer:

x ={-3,7/3}

Step-by-step explanation:

3 0
2 years ago
Anastasia is grocery shopping with her father and wonders how much shopping is left to do. "We already have 60 percent of the it
Ilia_Sergeevich [38]
Hi

Left to do 40% of the shopping

12 items ⇒ 60% of the items
x items ⇒ 40% of the items

60x = 12(40)
60x = 480
x = 480/60
x = 48/6
x = 8 items 

Answer:

Left 8 items of the list (40% of the shopping)

Items: 12+8 = 20 items on her list
4 0
3 years ago
Read 2 more answers
An art class contains 87 jars of paint. One third of the paint colors is red the remaining two thirds is purple.what is the rati
AlexFokin [52]

9514 1404 393

Answer:

  2 : 1

Step-by-step explanation:

  purple : red = (2/3) : (1/3) = 2 : 1

The ratio of purple paint to red paint is 2 : 1.

3 0
2 years ago
Read 2 more answers
Which of the following is a polynomial with roots 2, 3i, and −3i? f(x) = x3 − 2x2 + 6x − 9 f(x) = x3 − 6x2 + 9x − 18 f(x) = x3 −
Andreas93 [3]
F(x) = x3 − 2x2 + 9x − 18
4 0
3 years ago
Read 2 more answers
Other questions:
  • PLEASE HELP!!!
    8·2 answers
  • What is the union for two sets a={1,5,8,12,17} and b={5,17}
    9·1 answer
  • Adam celebrated his eighteenth birthday with friends at a Chinese restaurant. The bill came to $287.69 without tax. The service
    7·1 answer
  • Each parent was asked to bring 2 apples and 3 oranges for snacks after the soccer game. The equation below represents the total
    10·1 answer
  • If a quadrilateral has three angles measuring 60',45' and 100' what is the angle of the fourth angle​
    14·1 answer
  • You want to make bouquets of balloons. You choose 15 and 12 balloons. Every bouquet will have the same number of each color. Wha
    6·1 answer
  • Which number, when rounded to the nearest tenth, is 43.6
    11·2 answers
  • Write and solve a problem in which you have to transform units. use the rate 45 people per hour om your question.
    13·1 answer
  • 30 points!
    7·2 answers
  • 1. Is 2/12 = 5/28 a true proportion?
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!