How do you solve the system of equations #-x + 5y = - 15# and #6x + 5y = 20#?

1 Answer
David G.
Jul 25, 2017

Subtract the first equation from the second, and the answer is #7x=35#. Divide both sides by #7# and the solution is #x=5#.

Explanation:

#6x+5y=20# minus #-x+5y=-15# can be written as:

#(6x-(-x))+(5y-5y)=(20-(-15)#

This simplifies to #7x=35#.

Then #(7x)/7=35/7#

#x=5#

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