X+y=9 ×=2y How do you solve this using the substitution method?

1 Answer
Bill Jorgensen
May 26, 2018

#x=6#

#y=3#

Explanation:

#x+y=9#

#x=2y#

so you "substitute" #2y# for #x# in the first equation:

#x+y=9#

#(2y)+y=9#

#3y=9#

#y=3#

now "substitute" #3# for #y# in the first equation to solve for #x#:

#x+y=9#

#x+(3)=9#

#x=6#

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