How do you solve the system of equations #3x + 2y = 12# and #6x +3y = 21#?

1 Answer
ali ergin
Mar 12, 2016

#x=2#
#y=3#

Explanation:

#3x+2y=12" (1)"#
#color(green)(2)(3x+2y)=color(green)(2)*12#
#6x+4y=24#
#color(red)(6x)=24-4y#
#6x+3y=21#
#color(red)(24-4y)+3y=21#
#-y=-3#
#y=3#
#"use (1)" #
#3x+2*3=12#
#3x=12-6#
#3x=6" "x=6/3#
#x=2#

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