Si se oferta un producto al 10% de descuento, esto significa que el precio final del producto será 90% del precio original. Para hallar estos datos, debemos usar una regla de tres, de la siguiente forma:

100% 90%

-------------------- → ---------------------------

Precio Original Precio con Descuento?

SARAPES

- Ana: descuento (14), precio rebajado 126

Precio rebajado = 140.90 / 100 = 126

Descuento: 140 - 126 = 14

- Javier: descuento (8), precio rebajado 72

Precio rebajado = 80.90 / 100 = 72

Descuento: 80 - 72 = 8

ARETES

- Luis: descuento (5), precio rebajado 72

Precio rebajado = 50.90 / 100 = 45

Descuento: 50 - 45 = 5

- Ana: Precio original (60) , descuento (6), precio rebajado 54

Precio original: X.0,10 = 6

X = 60

Precio rebajado: 60 - 6 = 54

- Javier: Precio original (40) , descuento (4), precio rebajado 36

Precio original: X.0,10 = 4

X = 40

Precio rebajado: 40 - 4 = 36

6 0

3 years ago

What is the step by step process of this question

drek231 [11]

Hello there!

In order to solve this system of equations, you would first need to make one equation have a negative variable.

2a + 3b = -1
(3a + 5b = -2) -1

2a + 3b = -1
-3a - 5b = 2

Now, we have to modify the equations for it to be able to cancel out a variable. To do this, you would need to look at the least common multiple.

2: 2, 4, 6, 8, 10
3: 3, 6, 9, 12, 15

One least common multiple would be 6 so let's modify the equation!

(2a + 3b = -1) 3
(-3a - 5b = 2) 2

6a + 9b = -3
-6a - 10b = 4

Now, let's cancel out the variable and solve for b.

9b = -3
-10b = 4

-1b = 1
b = -1

In order to solve for a, just plug in the b into one equation and solve for a.

2a + 3(-1) = -1
2a - 3 = -1
2a = 2
a = 1

The answer would be a = 1 and b = -1

7 0

4 years ago