Posted by jaton on Saturday, August 4, 2012 at 12:31am.
x + 3 y = 7 Subtract 3 y to both sides
x + 3 y - 3 y = 7 - 3 y
x = 7 - 3 y
Put x = 7 - 3 y into equation x + 4 y = 12
7 - 3 y + 4 y = 12
7 + y = 12 Subtract 7 to both sides
7 + y - 7 = 12 - 7
y = 5
Replacing y = 5 into x = 7 - 3 y gives
x = 7 - 3 * 5
x = 7 - 15
x = - 8
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