kalisover kalisover

14-07-2020
Mathematics

contestada

Which of the following (x,y) pairs is the solution for the system of equations x+2y=4 and -2x+y=7

Respuesta :

14-07-2020

Answer:

(-2 ,3)

Step-by-step explanation:

Step 1: Rewrite first equation

x = 4 - 2y

-2x + y = 7

Step 2: Substitution

-2(4 - 2y) + y = 7

Step 3: Solve y

-8 + 4y + y = 7

-8 + 5y = 7

5y = 15

y = 3

Step 3: Plug in y to find x

x + 2(3) = 4

x + 6 = 4

x = -2

Answer Link

Otras preguntas

Why must corporate managers use multiple techniques of project evaluation? Which technique is most commonly used and why? Describe several ways you may be able

Question 16Which of the following may not be used when securing a wireless connection? (select multiple answers where appropriate)WEPVPN tunnellingOpen Access P

What do all cells need in order to function

1. Find the conditional probability of the indicated event when two fair dice (one red and one green) are rolled. The sum is 6, given that the green one is eith

Morgan Company issues 10%, 20-year bonds with a par value of $760,000 that pay interest semiannually. The amount paid to the bondholders for each semiannual int

in the diagram, find the values of a and b.

what is the correct symbol?

¿por que la toria de lamarck sobre el alargamiento del cuello de las jirafas por el esfuerzo continuado no pasara a sus descendientes? Porfa es ciencia y ambien

1. Question: How does temperature affect the growth of bacteria? Procedures: A scientist places three different petri dishes in 20C, 35C, and 60C. After 2 days,

Let f(x)=x^2 and g(x)=x-3. Find (f º g)(-1).