Question 196178: x + 3y = 7
-x + y = -3
Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website! Solve using the addition method:
x + 3y = 7
-x + y = -3
.
Add both equations together:
x + 3y = 7
-x + y = -3
------------
4y = 4
divide both sides by 4:
y = 1
.
Substitute the above into:
x + 3y = 7
And solve for 'x':
x + 3(1) = 7
x + 3 = 7
x = 4
.
Answer:
(x,y) = (4,1)
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