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Genrish500 [490]
3 years ago
14

Y=x^2- x + 2, y = x + 5 Solve by substitution I need the work shown please

Mathematics
1 answer:
Anika [276]3 years ago
3 0

Here you are . i think thais is the asnwer

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Ana ha comprado libros, todos del mismo precio, por valor de 120 euros. El librero le regala 3 libros por lo que cada libro le c
lidiya [134]

Answer:

El primer paso será darle un nombre a nuestras variables:

x= Numero de libros comprados inicialmente

y=Precio inicial de los libros

Ahora analizamos el enunciado,

Lorena ha comprado libros todos del mismo precio por valor de 120 €

x*y=120 € (1)

El librero le regala 3 libros por lo que en realidad cada libro que cuesta 2 € menos

(x+3)(y-2)=120€ (2)

Tenemos entonces dos ecuaciones con dos incógnitas, así que podemos resolver,

Despejamos en (1)

x=120/y

Sustituimos en (2)

(120/y +3)(y-2)=120

120 - 240/y + 3y -6 =120

3y-240/y =120-120+6

3y -240/y =6

y- 80/y=6

y²-80=6y

y²-6y-80=0

Resolvemos la ecuación de segundo grado

a=1

b=-6

c=-80

Aplicando la resolvente,

(6+- √36+320)/2

6+-√356/2

(6+-18,86)/2

Como el valor de y no puede ser negativo la unica respuesta válida será:

y=12,43

Cada libro le costo 12,43€

Sustituyendo en (1)

x=120/12,43

x=9,65 como no puede ser un número racional

x=9

Lorena ha comprado 9 libros

6 0
3 years ago
Find the area of the circle r=3 ft.
Irina-Kira [14]

Answer:

28.27

Step-by-step explanation:

first you have to stablish the formula for the area of the circle, which is A=pi×radius square. Then, you have to substitute the variables and solve. the formula with the numbers plugged in would be A=3.14×3 square. Finally, solve by multiplying 3×3=9, so the formula would be 9×3.14, when multiplyed, your answer would be 28.27 if you round it.

3 0
4 years ago
Multi-step equations <br><br> What’s the answer?
masya89 [10]

Answer:

what is the equation and question

8 0
4 years ago
Find (9.3 × 106) + (1.8 × 104)
inysia [295]

Answer:

1,173

Step-by-step explanation:

9.3x106=985.8

1.8x104=187.2

985.8+187.2=1,173

<h2><em><u>Could I please have BRAINLIEST?</u></em></h2>
6 0
3 years ago
Read 2 more answers
15-18, use the properties of the exponents to write an equivalent expression for each given expression.
Leto [7]

15.

( {4}^{4} ) {}^{3}

=  {4}^{4 \times 3}

=  {4}^{12}

= 16777216

___________________________________________

16.

\frac{ {3}^{12} }{ {3}^{3} }

=  {3}^{12 - 3}

=  {3}^{9}

= 19683

___________________________________________

17.

{4}^{5}  \times  {4}^{2}

=  {4}^{(5 + 2)}

=  {4}^{7}

= 16384

___________________________________________

18.

{6}^{4}  \times  {2}^{4}

=  ({6 \times 2})^{4}

=  {12}^{4}

= 20736

6 0
3 years ago
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