How do you solve by substitution #x + y = 4# and #y = 2x + 1 #?

1 Answer

Jun 8, 2015

#{x+y=4#
#{y=2x+1#
Take the second and substitute into the first for #y#:
#x+(2x+1)=4#
#3x=3#
#x=1#
Back into equation 2:
#y=2+1=3#
Solution:
#x=1#
#y=3#

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How do you solve by substitution #x + y = 4# and #y = 2x + 1 #?

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