How do you find the solution of the system of equations #-x + y = 12 # and #x + 2y = 3#?

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Answer 1 · 2015-05-06T22:10:08

Try this:
#-x+y=12#
#x+2y=3#
Add the first to the second:
#//+3y=15#
So: #y=5#
Substitute into the first:
#-x+5=12#
#x=-7#