[See Solution] Solve each system by the addition method. a.) - = -4 + = 0 b.) x + y = 1200 0.12x + 0.09y =
Question: Solve each system by the addition method.
a.)
-
= -4
+
= 0
b.) x + y = 1200
0.12x + 0.09y = 120
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