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
Delicious77 [7]
3 years ago
9

I need a step by step explanation on how you solved the equation.

Mathematics
1 answer:
Ghella [55]3 years ago
7 0

Answer: x=3 and y=−2

Step-by-step explanation:

x=−2y−1;4x−4y=20

Step: Solve x=−2y−1 for x:

Step: Substitute−2y−1 for x in 4x−4y=20:

4x−4y=20

4(−2y−1)−4y=20

−12y−4=20(Simplify both sides of the equation)

−12y−4+4=20+4(Add 4 to both sides)

−12y=24

−12y

−12

=

24

−12

(Divide both sides by -12)

y=−2

Step: Substitute−2 for y x=−2y−1:

x=−2y−1

x=(−2)(−2)−1

x=3(Simplify both sides of the equation)

You might be interested in
Mezclas de alimentos. Un chef repostero creó una solución de azúcar de 50 onzas constituida por 34% de azúcar con una solución d
Kay [80]

Answer:

Las cantidades empleadas para su preparación son: 15 onzas de solución al 20 % y 35 onzas de solución al 40 %.

Step-by-step explanation:

Podemos estimar la proporción de ingredientes mediante el siguiente promedio ponderado:

0.34= \frac{0.2\cdot m_{A} + 0.4\cdot m_{B}}{m_{A}+m_{B}} (1)

Donde:

m_{A} - Masa de la solución al 20 %, en onzas.

m_{B} - Masa de la solución al 40 %, en onzas.

Podemos simplificar la formula como sigue:

0.2\cdot x + 0.4\cdot (1-x) = 0.34 (2)

Donde x es la proporción de la solución al 20 % dentro de la solución final, sin unidades.

Ahora resolvemos para x en (2):

0.4-0.2\cdot x = 0.34

0.2\cdot x = 0.06

x = \frac{0.06}{0.2}

x = 0.3

Este resultado quiere decir que la solución al 34 % es el resultado de 30 % de la solución al 20 % y 70 % de la solución al 40 %. Si conocemos que la solución final tiene una masa de 50 onzas, entonces las cantidades empleadas para su preparación son: 15 onzas de solución al 20 % y 35 onzas de solución al 40 %.

4 0
3 years ago
The ratio 2.5m to 60cm can be written in the form 1:n find the value of n. someone please help asap
Svetach [21]

Answer:

24

Step-by-step explanation:

2.5 divided by 2.5 equals 1. So 60 divided by 2.5 equals 24.

5 0
2 years ago
Read 2 more answers
Evaluate the radical.<br> (Look at the photo)<br> Enter your answer in the box.
faltersainse [42]

Answer:

3

Step-by-step explanation:

This is a cube root so think what times what times what is 27?

3 x 3 x 3 = 27 so the answer is 3

Same problem explained

https://www.mathsisfun.com/numbers/cube-root.html  < in detail.

Very helpful website check it out

(It's not a random download link or whatever, look at my profile- i dont do that, its completely safe and legit.)

3 0
3 years ago
Simplify your answer is much is possible X = what
DENIUS [597]

Answer:

x=3 is your answer

Step-by-step explanation:

Hope this helps :)

8 0
3 years ago
Whoever is good at math, please help!
otez555 [7]

Answer:

I think it is 37.5°.

Step-by-step explanation:

6 0
3 years ago
Other questions:
  • The equation T^2=A^3 shows the relationship between a planet’s orbital period, T, and the planet’s mean distance from the sun, A
    6·1 answer
  • Use the substitution method to solve the following system of equations:
    11·2 answers
  • If 102y = 25, then 10-y equals:<br><br> (a) -1/5, (b) 1/625, (c) 1/50, (d) 1/25, (e) 1/5
    12·1 answer
  • SIMPLIFY THE EXPRESSION: -5(7 − 2m)=
    12·1 answer
  • Find this <br> unit rate 720 kilometers per 15 liters
    5·1 answer
  • Find the differential of the function. v = 2y cos(xy)
    14·1 answer
  • Create an equation with a solution closest to 0 using digits 1 to 9
    14·1 answer
  • What is the term to term rule of 64 32 16 8 4
    11·2 answers
  • Please helppppppppppppppp
    9·1 answer
  • Find the value of x. <br> a) x=109 <br> b) x=115<br> c) x=95<br> d) x=129
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!