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
Elis [28]
3 years ago
5

Which properties justify the steps taken to solve the system?

Mathematics
1 answer:
uranmaximum [27]3 years ago
8 0

Answer:

Step-by-step explanation:

The given equations are:

2a+7b=0 and 3a-5b=31

Statement                                                                    Reason

1. 10a+35b=0, 21a-35b=217    (Multiply first equation by 5 and second by 7)

2. 31a=217                                (Adding both the equations)

3. a=7                                       (Dividing both sides by 31)

4. 2(7)+7b=0                            (Substituting a=7 in first equation)

5.14+7b=0                                (solving step 4)

6. 7b=-14                                  (Subtracting 14 on both sides)

You might be interested in
A blue whale traveled 31 1/2 miles in 2 1/4 hours. What was the whales rate in yards per hour ( 1 mile = 1,760 yards
tekilochka [14]

Answer: 25594.018691648 yards per hour

3112÷214=14.5420560748

14.5420560748×1760=25594.018691648

Step-by-step explanation:

6 0
3 years ago
A toy store paid $300 for the rights to sell Cloud Crowd stuffed animals. Each stuffed animal costs the store $2 and sells for $
professor190 [17]
If a toy store paid $300 for the rights to sell Cloud Crown stuffed animals then they must sell at least 100.
3 0
3 years ago
Can someone make sure that the first one is right and can someone help me with the second one please I need to get this right pl
VLD [36.1K]

Answer:

1. B

2. A

Step-by-step explanation:

1. Here, the figure is reflected over the line depicted. This answer is correct.

2. Here the image shifts down and across, making it a glide.

3 0
4 years ago
Find the value of arc AD
LenaWriter [7]
So hmmm if we use the "intersecting chords theorem", the angle of 93°, is really 1/2 * (arcBC + arcAD)

thus \bf 93=\cfrac{1}{2}(\widehat{BC}+\widehat{AD})\implies 93=\cfrac{161+\widehat{AD}}{2}
\\\\\\
186=161+\widehat{AD}\implies 186-161=\widehat{AD}
7 0
3 years ago
if a hundred count of idaho baker potatoes costs 25.54 how much would one potato cost? round to the nearest penny
Damm [24]

Answer:

$3.91

Step-by-step explanation:

This is a fraction equal to

100 count ÷ 25.54 cost

We want a unit rate where

1 is in the denominator,

so we divide top and bottom by 25.54

100 count ÷ 25.54

25.54 cost ÷ 25.54

=  

3.915427 count

1 cost

=  

3.915427 count

cost

= 3.915427 count per cost

3 0
4 years ago
Other questions:
  • What is 3 over 2 divided by 1 over 4
    9·1 answer
  • Please help with simplifying 2|-16.75|
    12·2 answers
  • A football team loses 3 yards in 3 consecutive plays. what is the total yardage gained?
    6·2 answers
  • Hat value is needed to fill in the blank to make this trinomial a perfect square trinomial. 4x2 + __x + 81?
    7·1 answer
  • An oil painting originally cost $5500 and increases in value at a rate of 4% per year . Find the value of the painting after 15
    6·1 answer
  • Please can someone help me solve 10x+5=15
    9·2 answers
  • Target sells a pack of iTunes gift cards for $40. Sam's Club sells them for $38.88. What is the percent decrease from Target's p
    5·1 answer
  • Student A, B and C con complete a puzzle in 20 min, 15 min, and 30 min respectively. If all three student work together, how lon
    10·1 answer
  • How many significant figures does 0.0102 have?
    13·1 answer
  • A student has a container with a volume of 2.5 estimates the volume to be 2.6 By what percent is the​ student's estimate​ off
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!