misspiniasc misspiniasc
  • 22-05-2015
  • Mathematics
contestada

Systems of equations in two variables with applications

-2x+7y=2
3x-5y=-14

Respuesta :

apologiabiology
apologiabiology apologiabiology
  • 22-05-2015
onne way is to eliminate terms
-2x+7y=2
3x-5y=-14
multiply first equation by 3 and second equaiton by 2
-6x+21y=6
6x-10y=-28
add them together to cancel x terms
-6x+21y=6
6x-10y=-28  +
0x+11y=-22
11y=-22
divide by 11
y=-2
subsitute
-2x+7(-2)=2
-2x-14=2
add 14 to both sides
-2x=16
divide both sides by 2
-x=8
multiply -1
x=-8



x=-8
y=-2
in (x,y) form
(-8,-2)

Answer Link

Otras preguntas

How many levels of government are there in China?
Simplify. All Variables represent (3√200)*(4√32)
A penny, a nickel, a dime, and a quarter are tossed. What is the probability of obtaining at least one head on the tosses?
what are the Confederate states?
when two or more forces act together on an object what do they combine to form
Which type of force pulls objects toward one another
how do you inscribe a square in a circle?
a box contain 9 novels, 7 biographies, and 5 reference books. Alyssa randomly chooses a book, then she randomly chooses another book without replacing the first
a box contain 9 novels, 7 biographies, and 5 reference books. Alyssa randomly chooses a book, then she randomly chooses another book without replacing the first
How many halves are there in 23