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
Alinara [238K]
4 years ago
5

Elimination using addition and subtraction. -4x+4y=-20 -2x+4y=-2

Mathematics
2 answers:
Orlov [11]4 years ago
4 0
For addition:
-4x+4y=-20 (multiply by -1) to get 4x-4y=20
-2x+4y=-2 (Leave as it is) to get -2x+4y=-2
Add together to eliminate the y term
Solve for x (x=9)
Plug in x to either equation to get y (y=4)
Answer: (9,4)

For subtraction:
-4x+4y=-20
-2x+4y=-2
Since the equations are already ready for elimination by subtraction, just Subtract to eliminate the y term
Solve for x (x=9)
Plug in x to either equation to get y (y=4)
Answer: (9,4)
goldfiish [28.3K]4 years ago
3 0

I would subtract the 2nd from the first one

so -4x - -2x = -2x

4y - 4y = 0

-20 - -2 = -18


-2x = -18

now I would divide that by -2 to get the value for x

so no we have x = 9


now you just have to substitute that into one of the equations and simplify to get y


-2 X 9 + 4y = -2

-18 + 4y = -2

4y =16

y = 4



You might be interested in
Order the decimals from least to greatest.<br><br> 1.45, 2.56, 0.99
zvonat [6]

Answer:

0.99, 1.45 then 2.56 will be the greatest!

7 0
3 years ago
How many solutions does the equation x^2-9x=-8 have?
Elza [17]
X^2-9x=-8
x^2-9x+8=-8+8
x^2-9x+8=0
(x-8)(x-1)=0

x-8=0
x-8+8=0+8
x=8

x-1=0
x-1+1=0+1
x=1

There are 2 solutions, which are 1 and 8 
8 0
3 years ago
What is the constant term in the expression 6 x 3^y + 8x^2 + 5x + 7
serious [3.7K]

Answer:

The constant term is 7

4 0
3 years ago
Read 2 more answers
Cual es el resultado de (7.006×10⁴¹)×(5.09×10²²)<br><br>​
Murljashka [212]

Answer:

El resultado de (7.006×10⁴¹)×(5.09×10²²)=3.566054*10⁶⁴

Step-by-step explanation:

La notación científica es una manera rápida de representar un número utilizando potencias de base diez.

Los números se escriben como:

a*10ⁿ

donde:  

  • a es un número real mayor o igual que 1 y menor que 10.
  • n es un número entero, que recibe el nombre de exponente u orden de magnitud. Representa el número de veces que se desplaza la coma. Siempre es un número entero, positivo si se desplaza a la izquierda, negativo si se desplaza a la derecha.

Para realizar la multiplicación con notación científica, debes multiplicar las magnitudes afectadas por las potencias de 10 y, por separado, multiplicar las potencias de 10, recordando la propiedad:

  • Si dos bases son iguales (el mismo número o variable), y son los factores de una multiplicación, ambas bases quedan en una sola y sus exponentes son sumados: xᵃ*xᵇ= xᵃ⁺ᵇ

En este caso:

(7.006×10⁴¹)×(5.09×10²²)=(7.006*5.09)*(10⁴¹*10²²)=35.66054*10⁴¹⁺²²= 35.66054*10⁶³

Siguiendo el formato a*10ⁿ, debes ajustar el valor de la base a de manera que sea un número real mayor que 1 y menor que 10. Entonces, se mueve la coma decimal hacia la izquierda tantos espacios hasta llegar a la derecha del primer dígito.  Y se escribe la base 10, al cual el exponente se suma la cantidad de espacios que se mueve la coma, que es un número positivo porque la coma se desplaza a la izquierda.

Entonces 35.66054*10⁶³= 3.566054*10⁶⁴

<u><em>El resultado de (7.006×10⁴¹)×(5.09×10²²)=3.566054*10⁶⁴</em></u>

4 0
3 years ago
Give 3 angle measures of a right triangle ?​
expeople1 [14]

Answer:

60,60,60

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • W(x)=x^3 - 5x^2 + 8x - 4<br> I need the x and y intercepts and the behavior of this equation.
    11·1 answer
  • Which list shows the order of original appearance on earth, from the earliest to the most recent organism? A. bacteria, lizards,
    6·1 answer
  • Estimate 306.9 divided by 6.4
    8·2 answers
  • Find the value of 15.0 NN in pounds. Use the conversions 1slug=14.59kg1slug=14.59kg and 1ft=0.3048m1ft=0.3048m.
    9·1 answer
  • Can you please help me with this one? ​
    6·2 answers
  • Convert 78% to a decimal
    14·1 answer
  • Someone please help me, this test determines if I pass or not.
    10·1 answer
  • Pls help asap u will be rewarded
    11·2 answers
  • Simplify the following expression.<br><br><br><br> (3x−6)+(5x−5)<br> PLEASE I NEED HELP
    8·2 answers
  • On a shelf at a gaming store, there are five Sony Playstations and three Nintendo Wii consoles left. If one gaming system is sel
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!