audreyburkett12 audreyburkett12

16-02-2017
Mathematics

contestada

Solve the system using elimination
2x+3y=9
x+5y=8

A.(0,3)
B.(-2,2)
C.(-1/2,10/3)
D.(3,1)

Respuesta :

apologiabiology apologiabiology

16-02-2017

eliminate x's
multiply 2nd equation by -2 ad add to first

2x+3y=9
-2x-10y=-16 +
0x-7y=-7

-7y=-7
divide by -7
y=1

sub back

2x+3y=9
2x+3(1)=9
2x+3=9
minus 3
2x=6
divide 2
x=3

x=3
y=1

(x,y)
(3,1)

D

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