27-04-2015
Mathematics

contestada

Solve, using the substitution method
2x+4y=16 x-7=-4y

A. (0,-7)
B. (0,7/4)
C. (9,-1/2)
D. (17,-5/2)

PLEASE HELP ASAP !!

Respuesta :

27-04-2015

2x+4y=16
x-7=-4y

4y=16-2x
4y=16-2(-4y+7)
4y=16+8y-14
-4y=2
-4y/-4=2/-4
y=-0,5

2x=16-4(-0,5)
2x=16+2
2x/2=18/2
x=9

C

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