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
LiRa [457]
3 years ago
6

The work of a student to solve a set of equations is shown below: Equation 1: x + 2y = 10 Equation 2: 2x + 5y = 15 Step 1: −2(x

+ 2y) = −2(10) 2x + 5y = 15 Step 2: −2x − 4y = −10 2x + 5y = 15 Step 3: 1y = 5 Step 4: x + 2(1) = 10 Step 5: x = 8 In which step did the student first make an error?
Mathematics
2 answers:
DIA [1.3K]3 years ago
6 0
 −2x − 4y = −10 2x + 5y = 15 
Llana [10]3 years ago
6 0

Answer:

Step 2 has error and step 4 has error.

Step-by-step explanation:

Here we can see that elimination method is  applied to solve the  system  of equations  for which -2 is multiplied both sides of equation first

-2(x+2y)=-2(10 which is correct

but in step 2

left side is -2x-4y and the right side is -10 which has to be -20 which makes this step wrong and this is the error made by student.

in Step 4 also ,value of the y has to be 5 but student plugged y =1 which is also error by student.

Correct solution is

    -2x-4y= -20

      2x+ 5y= 15

on adding ,we get

 y = -5

plugging y =5 in equation x+2y= 10 ,we get x+2(-5) =10 ,we get x = 20

therefore (20,-5) is the  solution

You might be interested in
Illustrate the <PAT and <LAB are vertical angle?​
timama [110]

Answer

1. Draw a diagonal straight line PT.

2.Draw an another straight diagonal line LB that intersect at a point.

3. Label that Point A.

<em>Using</em><em> </em><em>Euclid</em><em> </em><em>Book</em><em> </em><em>1</em><em> </em><em>Proposition</em><em> </em><em>15</em>

<em> </em><em>If</em><em> </em><em>two straight lines cut one another, then they make the vertical angles equal to one another.</em><em>.</em>

8 0
3 years ago
Write the formula for the sum of 7 consecutive numbers if the first number is m. \
vlabodo [156]

Answer:

Step-by-step explanation:

If you have an odd number of consecutive numbers, the middle number should be x. So 7 of them would be written as

(x - 3)+(x - 2) + (x - 1) + x + (x + 1) + (x + 2) + (x+3)

That way all you are left with is 7x because the integers cancel.

That is not your question

You question is

Sum = m+(m + 1)  + (m + 2) + (m + 3) + (m + 4) + (m + 5) + (m + 6)

3 0
3 years ago
Read 2 more answers
Two-fifths of one less than a number is less than three-fifths of one more than that number. What numbers are in the solution se
Nutka1998 [239]
The answer is c that what i think
6 0
3 years ago
Wimming Pool On a certain hot summer's day, 528 people used the public swimming pool. The daily prices are $1.25 for children an
Lubov Fominskaja [6]
The answer is 2,770.3125 or you want me to check for a other answer
7 0
3 years ago
Read 2 more answers
How do algebra tiles help you solve equations?
Harlamova29_29 [7]

Answer:

Algebra tiles make solving equations, merging like words, or factoring polynomials a visual operation, similar to students using counters to make sense of addition in elementary school, or students using number lines to make sense of integers.

Step-by-step explanation:

i hope this helped

7 0
3 years ago
Other questions:
  • In the data set below, what is the mean absolute deviation?
    10·1 answer
  • Solve the multi step equation <br><br> PLEASE SHOW WORK
    15·1 answer
  • HELP ASAP with this question.
    5·2 answers
  • What are the coordinates of D’
    10·1 answer
  • Find numerator that makes statement true? 2/4 is less than /6
    7·1 answer
  • List 3values that would mak this inequality true 2n&lt;6
    9·1 answer
  • Can someone please help me with this problem​
    13·1 answer
  • What's <br><img src="https://tex.z-dn.net/?f=%20%5Csqrt%7B33%20%2B%209%20-%206%7D%20" id="TexFormula1" title=" \sqrt{33 + 9 - 6}
    6·2 answers
  • A movie theater is giving snack coupons with every ticket that is purchased. The table shows the type of snack coupon that was r
    6·1 answer
  • Ammaar put 4/7 of the money he earned raking leaves in the bank. He spent 1/3 of the money on a book.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!