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
Arisa [49]
3 years ago
12

Solve the following systems of equations using the substitution method. What is the value of a? 3a-5b=10 a+7b=12 A) a=5 B) a=6 C

) a=1 D) a=7

Mathematics
2 answers:
Alex_Xolod [135]3 years ago
8 0

Answer:

a=5

Step-by-step explanation:

3a-5b=10

a+7b=12

multiply the second row with -3

-3a-21b=-36 now we gonna add this to the first row

3a-5b=10

_________+

-26b=-26 b=1 now we gonna put in one of the equations to find a

a+7b=12

a+7.1=12 a=5

Naya [18.7K]3 years ago
5 0

Answer:

i hope its clear . the answer is a = 5

You might be interested in
PICTURES ARE ATTACHED, PLEASE HELP :)
liq [111]

for the first one, use Pythagoras theory to find the answer which is

opposite2+adjacent2=hypotenus2

the 2 behind all of them describe the square of all of them

5 0
3 years ago
Andrew uses the equation 25(x-4)=30 x, where x represents the number of sales, to determine the number of items he needs to sell
pshichka [43]

Hello,

Start off by distributing 25 to both x and -4

25 * X = 25x & 25 * -4 = -100

25x - 100 = 30

At this point, we add 100 to both sides so we can get 25 to be seperate from 100.

25x = 130

To get rid of the 25, divide it in both sides:

130/25 = 5.2

The answer would be 5.2

I hope this helps you with your assignment!

6 0
4 years ago
Which equation below is a quadratic function translated (shifted) right 3
kirill115 [55]
B I would guess it’s kinda hard to understand
4 0
2 years ago
How many square inches are in 16 square feet
rewona [7]

Answer:

2304

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
What is the square root of 5 to the nearest interger
loris [4]
The square root of 5 is about 2.24. This value is closest to the integer 2
4 0
3 years ago
Read 2 more answers
Other questions:
  • Sausages come in packets of 10. Bread rolls come in packets of 15. Dan wants to buy enough packs of sausages and rolls so that t
    9·2 answers
  • PLEASE HELP!
    15·1 answer
  • One number is eight more than three times another number. If the sum of the numbers is 28, find the numbers.
    11·1 answer
  • -7+(-1)= what’s the answer?
    12·2 answers
  • Please help me with this question, will give brainliest.
    7·1 answer
  • How do i solve this problem while creating a quadratic equation ?
    11·1 answer
  • The Chambers family has a net monthly income of $6,500.
    6·1 answer
  • Is this answer correct?
    5·2 answers
  • On a coordinate plane, solid circles appear at the following points: (negative 5, negative 3), (negative 4, negative 4), (negati
    13·2 answers
  • 1+3+5+7+9+11+13+15+17+19+21 without adding
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!