How do you solve the system of equations #x- 4y = - 18# and #2x + y = - 9#?

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Answer 1 · 2018-01-30T11:59:05

#x=-6 and y=3#

Multiply the first equation by #-2#

#-2x+8y=36#

Add this equation to the second one. Thus

#9y=27#

So

#y = 3#

Replace #y# in the first equation:

# x - 12 = -18#

Thus

#x = -6#