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22-12-2016
Mathematics

contestada

Solve the system using an equivalent system

{-2x - y = 0
{3x - y = 10

A. (4,-2)
B. (-2,4)
C. (2,-4)
D (-4,2)

Respuesta :

apologiabiology apologiabiology

22-12-2016

add y to both sides in 1st equation
-2x=y
sub -2x for y in2nd equation
3x-(-2x)=10
3x+2x=10
5x=10
divide 5
x=2

sub back
-2x=y
-2(2)=y
-4=y

(x,y)
(2,-4)
C is ans

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