jasonrichmond40 jasonrichmond40

10-03-2017
Mathematics

contestada

If the first equation is multiplied by 3 and then the equations are added, the result is _____.

3x + y = 3
x - 3y = -2

A. 10x = 11
B. 10x = 7
C. 8x = 7

Respuesta :

baabaagreysheep baabaagreysheep

10-03-2017

When you multiply the first equation by 3, you get:
3 × 3x = 9x
3 × y = 3y (but when added, that part gets eliminated)
3 × 3 = 9
So you end up with
9x + 3y = 9
x - 3y = -2
(add)
10x = 7

So your answer is B. 10x = 7. I hope this helps!

Answer Link

Otras preguntas

The Middle East is a group of countries from three different continents clustered together based on culture. this grouping is called a? A.) Location B.) Region

cuando tengo frio yo bebo............agualos huevoslecheté

Can someone please help me??

A composer of musique concrète works with A. silence. B. random, chance-based composition. C. recorded sounds. D. a synthesized orchestra.

Compare the volumes of the rectangular prisms shown below. Which of the containers will hold more, X or Y? In your final answer, include all of your calculation

Consider the following graph of a quadratic function. Which of the statements are true? Select all that apply. A. The function is decreasing over the interval x

Find the discriminant of the quadratic $3x^2 - 7x + 6.$

In circle K, what is the value of x? x = 30° x = 25° x = 20° x = 15º

What is one way to determine if a quadrilateral has parallel sides

marta les _____ las invitaciones a sus amigos ayerA. DIERONB. DIOC. DID. DA