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
Serhud [2]
3 years ago
7

-27=-9x-18y -5y-10x-15=0

Mathematics
1 answer:
lora16 [44]3 years ago
4 0

Answer:

x=-3

y=3

Step-by-step explanation:

-27=-9x-18y    equation 1

-5y-10x-15=0    equation 2

using equation 2 we have:

-10x -15 =5y

y= -2x -3   equation 3

using equation 3 in equation 1 we have:

-27=-9x-18(-2x -3)

-27= -9x +36x +54

-27-54 =27x

-81 = 27x

so we have:

x= -81/27

x=-3

y= -2(-3) -3

y= 6-3

y = 3

You might be interested in
What is 30% of 70. show your work<br>​
mamaluj [8]

Answer: 21

Step-by-step explanation:

we have two simple equations:

1) 70=100%

2) x=30%

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

70/x=100%/30%

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 30% of 70

70/x=100/30

(70/x)*x=(100/30)*x - we multiply both sides of the equation by

70=3.33333333333*x - we divide both sides of the equation by (3.33333333333) to get x

70/3.33333333333=x

The fore, the answer is 21

8 0
3 years ago
Read 2 more answers
Whats the answer to -x² +6x + 18 = 0
emmainna [20.7K]

Answer:

Step-by-step explanation:

Step-1 : Multiply the coefficient of the first term by the constant   1 • -6 = -6  

Step-2 : Find two factors of  -6  whose sum equals the coefficient of the middle term, which is   2 .

3 0
3 years ago
Read 2 more answers
Can someone explain to me why it doesn’t show any extremum?
yKpoI14uk [10]
Huxsjxjsjxwxbwhudnuwudwudywydbywbhbdwbhdjwndjwbidnjwjdejndunundeuxnennxuenjjxenjxnjrncrnjncndjcnjencjejnjcnjenfuejndjjnenfjnendjwnjdnjwnc
5 0
3 years ago
i need help with number 7. its solving systems of equations by substitution. please show work!!! i need help
SIZIF [17.4K]
#7:
<span>Subtract </span>y<span> from both sides:
</span>-4x=6-y

Divide both sides by -4:

Answer:
x= -6-y/4


#7 part 2:

Add <span>y</span><span> to both sides:
</span>-5x=21+y

Divide both sides by -5:

Answer: x=-21+y/5

hope i helped!



7 0
3 years ago
Mercedes is going to have her car fixed. Cairo Prince Auto Tech charges $45 for an estimate plus $24 per additional hour of work
VMariaS [17]

Answer:

Answers May Vary

Step-by-step explanation:

Typically, Taratino's Car Garage will be the least expesive. The following equations for both auto shops:

Taratino's y=$30x

Cairo's y=$45+$24x

For x, that represents the total hours and y is total dollars

5 0
3 years ago
Other questions:
  • -3x-5y=15 what is the answer
    5·2 answers
  • What is the surface area of the solid that this net can form?
    11·2 answers
  • Bijan has agreed to run a half-marathon to raise money for charity. Each day before school, Bijan runs a 2.4-mile route around h
    6·2 answers
  • Find the solution of<br>​
    5·1 answer
  • Solve s = rθ for θ.<br><br> A) θ = rs <br> B) θ = r/s<br> C) θ = s/r<br> D) θ = 1/rs
    5·2 answers
  • Which are the solutions of the quadratic equation? x2 = 9x + 6 StartFraction negative 9 minus StartRoot 105 EndRoot Over 2 EndFr
    10·2 answers
  • 20 PTS!!!! What is the probability that a randomly selected person is on the swim team? Express the probability as a percent rou
    11·1 answer
  • I NEED HELP ASAP PLEASEEEE!!!!! Given the cube, what is the total surface area and volume?
    8·2 answers
  • Write an equation for the given points The points (20, -136) and (-35,-92) both lie on the line
    8·1 answer
  • Solve for m <br> 2= m/2 -7 <br> thanks in advance
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!