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hjlf
3 years ago
14

Solve the system of equations using substitution or elimination: x = 3y + 6 2x - 4y = 8

Mathematics
1 answer:
dem82 [27]3 years ago
5 0

Answer:

x=0, y=-2

Step-by-step explanation:

Let x=3y+6 be equation 1

and 2x-4y=8 be equation 2

sub equation 1 into equation2,

2(3y+6)-4y=8

6y+12-4y=8

2y=-4

y=-2

sub y=-2 into equation 1,

x=3(-2)+6

x=0

sub is an abbreviation for substitute

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-4x - 3 = -6x + 9 need help please.​
Valentin [98]

Answer:

6

Step-by-step explanation:

-4x -3 = -6x +9

-4x = -6x +12

2X = 12

x = 6

8 0
3 years ago
Read 2 more answers
steve has 500 more marbles than richard at first. he gives 300 marbles to richard. who has more marbles now, and by how many?
Yakvenalex [24]
Steve has x+500 marbles
richard has x marbles

if steve gives richard 300 marbles then
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8 0
3 years ago
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Una torre de 28.2 m de altura esta situada a la orilla de un rio, desde lo alto del edificio el ángulo de depresión a la orilla
Svet_ta [14]

Answer:

El ancho del río es 59.9 metros.

Step-by-step explanation:

El ancho del río lo podemos calcular con la siguiente relación trigonométrica asumiendo que la torre forma un triángulo rectángulo con el río:

tan(\theta) = \frac{CO}{CA}

En donde:

CA: es el cateto adyacente = Altura de la torre = 28.2 m

CO: es el cateto opuesto = ancho del río =?

θ: es el ángulo adyacente a CA

Dado que el ángulo de depresión (25.2°) está ubicado fuera de la parte superior de la hipotenusa del triángulo que forma la torre con la orilla opuesta del río, debemos calcular el ángulo interno (θ) como sigue:

\theta = (90 - 25.2)^{\circ} = 64.8 ^{\circ}

Ahora, el ancho del río es:

CO = tan(\alpha)*CA = tan(64.8)*28.2 = 59.9 m

Por lo tanto, el ancho del río es 59.9 metros.

Espero que te sea de utilidad!                  

4 0
2 years ago
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dmitriy555 [2]

Answer:

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Step-by-step explanation:

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8 0
3 years ago
Find the circumference and area <br> r = 5 m
stira [4]

Step-by-step explanation:

Let's get our relevant base equations listed out:

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area = pi*r²

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Thus, d=2*5m  = 10m, c=π*10m=10π m, and area = 25m²*π

Feel free to ask further questions!

4 0
3 years ago
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