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
Murljashka [212]
3 years ago
15

If 3x + 5y = 42 and 9x +7y = 78, then x + y = ?

Mathematics
1 answer:
kumpel [21]3 years ago
8 0
3x+5y=42

9x+7y=78

adding above equation

12x+12y=120

x+y=10
You might be interested in
Stan worked 4 years less than Marco.This year Stan has worked 29 years.If b is how long Marco worked, the equation b - 4 = 29 re
MA_775_DIABLO [31]

Answer:

Add 4 on both sides.

In the equation there is a -4.

If -4+4=0, that is how you would get rid of the -4.

But, you need to add 4 to 29 to really get rid of the -4.

So, 29+4 is 33.

b=33

6 0
3 years ago
Please solve!! solve for y 3x-y=16<br><br> Will name the Brainliest!!
algol [13]

Answer:

y= 5.333

Step-by-step explanation:

4 0
2 years ago
help please!! i really don’t understand how to do this and i just need an answer so i can get this class over with ;;
tigry1 [53]

Answer:

1/8

Step-by-step explanation:

(6(3)⁻¹(1))⁻³             n⁰=1

(6/3)⁻³

(2)⁻³

1/(2)³

1/8

Hope it helps

5 0
3 years ago
What type of conic section is given by the equation 4x^2+9y^2=36? What are its domain and range?
Damm [24]
4x^2+9y^2=36\\&#10;\\&#10;\frac{4x^2}{36}+\frac{9y^2}{36}=\frac{36}{36}\\&#10;\\&#10;\boxed{\frac{x^2}{9}+\frac{y^2}{4}=1}

This is a equation of a ellipse (0,0) centered

Domais: {x∈R/-3≤x≤3}
Range:{y∈R/-2≤y≤2}
4 0
3 years ago
Read 2 more answers
Which situation can be represented by the equation y = 12 x ?
Marat540 [252]

Answer:

Let's solve for x.

y=12x

Step 1: Flip the equation.

12x=y

Step 2: Divide both sides by 12.

12x /12 = y /12

x= 1 /12 y

Answer:  x= 1 /12 y

Step-by-step explanation: Hope this helps :D

5 0
2 years ago
Other questions:
  • A group of researchers is designing an experiment to test whether working late at night reduces a person's productivity. The res
    13·1 answer
  • HELP ASAP one solution to a quadratic function, f, is given below. (sqrt of 7) + 5i which of the following statements is true ab
    10·2 answers
  • Solving polynomial(2x+8)(-3y-8)​
    10·2 answers
  • A car travels 85 miles at an average speed of 34 mph. How many minutes does the journey take?
    10·1 answer
  • 2x – 8x + 6<br> What is the answer when factoring this equation
    9·2 answers
  • In a school, there is a ratio of 4 boys to 5 girls. If there are a total of 450 students, how many girls are there? *
    12·1 answer
  • Please help ASAP please give both answers :)
    10·1 answer
  • What is 14/4 as a mixed number?
    10·1 answer
  • NEED ANSWER ASAP,BRAINLIEST FOR CORRECT ANSWER. IM FAILING SCHOOL
    13·1 answer
  • Jenny knit a total of 12 centimeters of scarf over 2 nights. How many nights will Jenny have
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!