26-02-2015
Mathematics

contestada

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

Respuesta :

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

Otras preguntas

Malaria is caused by several species of -Toxoplasma. -Giardia. -Phytophthora. -Plasmodium.

The ____ of the numbers -4 and 4 is 4. Greatest? Correct me if I'm wrong

Which of the following shows the number of time 3 1/5 fits into 10 1/2

If 2x+y=8 and x-1=y then what is y? Please be detailed I want to know more then just the answer but how to solve

The equation of a circle is shown below. (x – 3)2 + (y – 2)2 = 9 Which statement is true about the center of the circle? It is located on the y-axis. It is loca

Find the modulo class to which the number belongs for the given modulo system. 69, mod 15 A. 2 B. 13 C. 9 D. 12

Find the area of each regular polygon. 12. 18gon with perimeter 72mm.

Round 141.999 to the nearest tenth, hundredth, ten, and hundred.

12 out of 142 people standing in line for tickets were going to see the movie in theater A. If there were a total of 1704 tickets sold, predict how many peopl

This doesn't represent a function.. right?