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
S_A_V [24]
3 years ago
14

What is the value of y in the solution to the system of equations?x y = 12x – 3y = –30

Mathematics
2 answers:
zhenek [66]3 years ago
8 0
X + y = 12 . . . . . . . . (1)
x - 3y = -30 . . . . . . . (2)
(1) - (2): 4y = 42
y = 10.5
arlik [135]3 years ago
4 0

Answer:

y=10.5

Step-by-step explanation:

we have

x+y=12 ------> equation A

x-3y=-30 ------> equation B

Multiply by -1 equation A

-1*(x+y)=-1*12 -------> -x-y=-12 ------> equation C

Adds equation B and equation C

x-3y=-30\\-x-y=-12\\ -----------\\-3y-y=-30-12\\-4y=-42\\y=42/4\\ y=10.5

You might be interested in
1. Chris takes 25 minutes to replace one car tyre.
vekshin1

Chris and Jim must replace a <em>total</em> quantity of 17 tyres.

<h3>What is the minimum number of tyres to be replaced?</h3>

In this problem we must use an inequality of the form f(x) ≥ a, where f(x) is the difference between the number of tyres replaced by Jim and the number of tyres replaced by Chris:

(25/20) · x - x ≥ 3

(5/20) · x ≥ 3

x ≥ 12

Then, the <em>minimum</em> number of tyres to be replaced is n = 15 + 12 = 17 tyres.  

To learn more on inequalities: brainly.com/question/20383699

#SPJ1

3 0
1 year ago
Write a recursive formula for the following sequence:10, 5, 0, -5,... *
Alika [10]

Answer:

decrease by 5

Step-by-step explanation:

n= 10

then in sequence,

n= n-5

4 0
3 years ago
What is the area of the triangle?​
Tpy6a [65]

Answer:

20.25

Step-by-step explanation:

To find the area of a triangle you do base x height/2

9x4.5/2

40.5/2= 20.25

8 0
3 years ago
Which of the following statements is true
konstantin123 [22]
Hey!

The answer is option c).

√9 is a rational number as √9 = 3..

while √10 is an irrational number..

Hope it helps^^

5 0
3 years ago
Hosting a breakfast brunch for 25 people, you plan to serve scrambled eggs. The grocery store sells eggs in cartons, and each ca
ratelena [41]
You need 7 cartons, 4•7=28 so you’ll be sure to have enough:)
3 0
3 years ago
Read 2 more answers
Other questions:
  • Find the GCF of 30 * 3 and 12 * 4
    15·2 answers
  • Solve and simplify <br> 2/5+1/4+7/10=
    5·2 answers
  • Can someone please help me with this!!! pleasee
    15·1 answer
  • If a function is odd, then which statement is true?
    9·1 answer
  • Plz help 3.15 math <br><br><br>liner graph to ansrew each equation​
    12·1 answer
  • Can you show how you solve the problem thanks
    8·2 answers
  • What is -6p - 3 = 9 plz help quick​
    10·1 answer
  • If Paul is 5 years old and Mei is 2 years old, how old will Mei be when Paul is 15?
    11·2 answers
  • Find the value of x.<br> M M<br> (2x<br> 10)<br> (2x + 40)<br> N<br> X=
    12·1 answer
  • Need precalc help. i’ll give brainliest
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!