alohamisskikiki
alohamisskikiki alohamisskikiki
  • 15-11-2016
  • Mathematics
contestada

Solve, using linear combination.
5x + y = 2
4x + y = 4

Respuesta :

michy5 michy5
  • 15-11-2016
5x+y=2
4x+y=4

5x+y=2
-1( 4x+y=2)

5x+y=2
-4x-y=2

your y'all cancel out so you r left with

x=-2
then you plug the x in to one of the equations
5(-2)+y=2
-10+y=2
then add 10 to both sides
y=12

Answer: x = -2 y = 12

there's the work and all its simple you just have to figure out how to get rid of y or x ( which ever is easier) and you can figure it out after that
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