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
Artyom0805 [142]
3 years ago
5

9. 3x + 9y = 18 y = x + 2 Substitution method

Mathematics
1 answer:
777dan777 [17]3 years ago
4 0

Answer:

x = 0

y = 2

Step-by-step explanation:

3x + 9y = 18 ---------eqn 1

y = x + 2---------eqn 2

Substitute eqn 2 into eqn 1, for the value of y

3x + 9( x + 2) = 18

3x + 9x + 18 = 18

12x + 18 = 18

12x = 18 -18

12x = 0

Divide both sides by 12 , to get the value of x.

12x/ 12 = 0/12

x = 0

Substitute x = 0 into eqn 2

y = x + 2

y = 0 +2

y = 2

Hint: to confirm the values

x = 0

y = 2

Let's take eqn 1 ,

3x + 9y = 18

3(0) + 9(2)

= 0 + 18

= 18

Correct

Let's take eqn 2

y = x + 2

Let's find y

y = 0 + 2

y = 2

Correct too

You might be interested in
Metallic silver has a density of 10.50. what is the mass, in g, of a silver ingot that is 28.0 cm long, 4.90 cm wide, and 3.60 c
frozen [14]

Answer:

5190 g

Step-by-step explanation:

Calculate the volume:

28.0 cm × 4.90 cm × 3.60 cm = 493.92 cm³

Density is mass divided by volume:

D = M / V

Solving for mass:

M = D V

Substituting values:

M = (10.50 g/cm³) (493.92 cm³)

M = 5186.16 g

Rounding to three significant figures, the mass is 5190 g.

3 0
3 years ago
If there are 25 students in a class and 13 are girls, what is the ratio of boys to girls? Is the relationship, part to part, par
Alexeev081 [22]
12 to 13 is the ratio.
3 0
3 years ago
What Is the dependent variable the shoe size or the height
Maurinko [17]

Answer:

The dependent variable is the shoe size

Step-by-step explanation:

7 0
3 years ago
How can u tell that 647 is less than 674?
Amiraneli [1.4K]
Look at the tenth's place. (:
5 0
3 years ago
Read 2 more answers
Solve for m 13x - 10<br> M<br> N<br> 7x - 10
lisov135 [29]

Answer:

x = 10

Step-by-step explanation:

Given:

Arc LM = 13x - 10

Arc MN = 7x - 10

Required:

Solve for x

Solution:

Recall: half a circle = 180°

Therefore,

Arc LM + Arc MN = 180°

13x - 10 + 7x - 10 = 180

Add like terms

20x - 20 = 180

20x - 20 + 20 = 180 + 20

20x = 200

20x/20 = 200/20

x = 10

7 0
3 years ago
Other questions:
  • The same brand of jelly beans comes in two sizes a 10 ounce bag for $1.99 and an 18 ounce bag for $2.99. Which size is the bette
    7·1 answer
  • Simplifying trigonometric expressions help?
    8·1 answer
  • A cube has a surface area of 3,750 Square feet how do I find the length of one side
    14·2 answers
  • The fair market rental rate for Fort Wayne was $611 in 2011 and $567 in 2005. Find the unit rate of change for rent in Fort Wayn
    7·1 answer
  • Find the probability of rolling factors of 8
    8·1 answer
  • Which equation represents the data shown in the table below?
    5·1 answer
  • A square has a side length of 4\19x - 9 units. what is its perimeter in terms of x?
    7·2 answers
  • -5(5c-3b-1) distribute property
    9·1 answer
  • Combine like terms : 2x+5x+10x
    15·1 answer
  • Which of these represents the equation of a line that passes through the points (-5, -4) and (3, 8)?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!