Mitiku D. answered • 05/18/15
Tutor
4.9
(205)
Electrical Engineer, Patient and Objective
Shatara,
Substitute y=125x like this 125x=75x+100
then add like this 125x - 75x = 100 + 75x - 75x
then you get 50x = 100
x = 2
y = 250
I hope this helps you
David W.
AND (answering the complete question) ---
Make one set of coefficients (either for x or y) the opposite of the other. We'll multiply the second equation by (-1)
-y = -125x
Add the two equations (since adding the same thing -- the second equation -- to both sides of an equation is allowed):
y = 75x + 100
-y = -125x
0 = -50x + 100
50x = 100
...
Note that we could simply subtract the two equations (instead of multiplying one of them by -1) and still satisfy the intent of "addition method." We could have called it "the addition or subtraction method."
then,
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05/18/15
Shatara G.
Thank you kindly!
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05/18/15
Shatara G.
05/18/15