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

Convert: How many minutes are in 3 days?

Which rhetorical devices did thoreau use in "Resistance to civil government"

Explain reasons why providers might not want to accept Medicaid patients.

if g (x) = 1/x^2 then g (x+h) - g (x)/h

Irwin has only $30 to spend at a carnival admission cost $5 lunch will cost $6 and each ride ticket cost a 1. 25 what is the number of ride tickets that she can

GO FAST / WILL MARK BRAINLIEST / WILL GIVE THANKS / WILL GIVE 5 STARS __Mg(s) + __HCI(aq) *arrow pointing right* __MgCi2(aq) + __H2(g) 1. After balancing the re

in the last test 40% of all students in Mrs.Well's class got grade A. How many students are studying in this class, if there were 28 A's on the test?

The half-life of radon-222 is 3.8 days. If a sample currently contains 3.1 grams of radon-222, how much radon-222 did this sample have 15.2 days ago? a 12.4 gra

six less than the product of eight and a number

In triangle ABC, m∠BAC = 50°. If m∠ACB = 30°, then the triangle is triangle. If m∠ABC = 40°, then the triangle is triangle. If triangle ABC is isosceles, and AB