26-02-2015
Mathematics

Answered

how to solve 2x+y=2 and x+y=-1

Answer :

apologiabiology apologiabiology

26-02-2015

so
2x+y=2
x+y=-1

multiply secion equation by -1
-x-y=1

add to first equation

2x-x+y-y=2+1
x=3
subsitute
3+y=-1
subtract 3
y=-4

x=3
y=-4

Answer Link

Other Questions

12.Dos fumadores consumen 3 cajetillas diarias. ¿Cuántos fumadores de las mismas características serán necesarios para con-sumir 90 cajetillas en 30 días

Find the missing probability.[tex]\[ P(A)=\frac{13}{20}, \quad P(A \cap B)=\frac{13}{25}, \quad P(B \mid A)=? \][/tex]A. [tex]\(\frac{21}{100}\)[/tex] B. [tex]

me podría ayudar porfa y por cierto esto no es de matemáticas es de geometría es q no me salió la opción

A species of fish was added to a lake. The population size [tex]$P(t)$[/tex] of this species can be modeled by the following function, where [tex]$t$[/tex] is t

How many terms are in the binomial expansion of [tex](a+b)^8[/tex]?\qquad terms

Drag each tile to the correct box. Match the individuals to their accomplishments.- Sarah George Bagley: labor leader and advocate of shorter work days- Lucreti

saan ginagamit ang mapa at globo

When encountering an error message stating "access denied as you do not have sufficient privileges or the disk may be locked by another process. You have to inv

In making a choice of Strategy you have been assigned to choose between alternatives the first thing you do is to which of the following?- Select one from the a

Compare and contrast the Two-Kingdom System and the Five-Kingdom System of classification. Highlight their strengths and weaknesses, and discuss how the Five-Ki