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

The total cost of admission to the ballet is $196.00 for 2 adults and 4 children. an adult admission is $14 more than a child. how much is an adult admission?

What is the answer to number 3? (Numerical Representations)

i have no clue how to do this need help

What is the best strategy for preparing facility in Stafford incidents that might put patience and others in danger

The+net+present+value+of+a+proposed+project+is+$20,000+at+a+discount+rate+of+5%+and+($28,000)+at+10%. +what+is+the+internal+rate+of+return+of+the+project,+to+th

Which choice is the correct graph of |x|<3

How do I solve and find x?

How do determine the trophic level of a species?

Everything goes well on the water. Of what is this symbolic?

among the three layers of the earth interiors which layer do you think is the most important? justify your opinions